Ganglion Cysts

A ganglion is a cystic swelling of clear, viscous, jelly-like mucin arising from a joint capsule or tendon sheath. Ganglia are the most common soft tissue masses of the hand and wrist, accounting for 50-70% of all soft tissue tumours in the region. Most have a pedicle or stalk connecting them to the underlying joint or tendon sheath, and the word "cyst" is technically a misnomer, as the histology below shows.

Who and where. Ganglia are more common in women than men (3:1) and peak between 20 and 40 years, and they account for 60-70% of soft tissue masses around the wrist. By location:

• Dorsal wrist - 60-70%, the most common
• Volar wrist - 18-20%
• Flexor tendon sheath - 10%
• DIP joint mucous cyst - 5%

Natural history. The course is variable, and many ganglia fluctuate in size with activity and wrist position. In Dias's prospective series 23 of 55 untreated dorsal ganglia (58%) resolved spontaneously over a mean of 70 months.

Recurrence after treatment. Recurrence after aspiration is 50-59%. After surgical excision the published figures diverge sharply by method of ascertainment: 21% pooled across 14 surgical series (Head), but 39% when patients themselves were asked at six years (Dias).

Gross appearance. The contents are thick, clear, viscous and jelly-like, colourless to pale yellow, with the consistency of thick synovial fluid. The wall is a translucent to white fibrous capsule, and the stalk usually joins it to the underlying joint capsule or tendon sheath.

Microscopy. The wall is compressed collagen fibres arranged in concentric layers, and it may contain scattered fibroblasts and occasional chronic inflammatory cells. The mucin it holds is acellular.

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The mucin. It is chemically similar to synovial fluid but with a higher protein and glucosamine content:

• Hyaluronic acid (a glucosamine polymer) - the main component
• Glucosamine and other mucopolysaccharides
• Albumin and globulin from serum
• Water - 95% by volume

Pathogenesis. The exact cause remains incompletely understood. The leading theories:

1. Synovial herniation - synovium pouches out through a defect in the joint capsule, and a one-way valve lets fluid accumulate
2. Mucoid degeneration - myxoid degeneration of periarticular connective tissue creates mucin pools that coalesce to form the cyst
3. Trauma - repetitive microtrauma causes collagen degeneration and mucin production
4. Synovial proliferation - aberrant mesenchymal tissue produces synovial-type cells that secrete mucin

How a ganglion forms. Formation is described as a multi-step process. Myxoid degeneration of connective tissue at capsular attachments or tendon sheaths creates focal pools of mucin, which coalesce into a larger cavity. A stalk connects the cavity to the joint capsule or tendon sheath, often at a ligamentous attachment site.

The one-way valve. The stalk lets fluid in from the joint during motion but resists its outflow, and the pumping action of wrist motion forces more fluid in, so the cyst gradually enlarges. This valve mechanism is widely accepted.

Symptoms. Cosmetic concern is often the primary complaint, especially in young women. Pain comes from capsular distension, impingement on adjacent structures or occult intraosseous extension, and an occult ganglion may cause pain disproportionate to its size. The perception of weakness is common but objective weakness is rare unless the mass compresses a motor nerve, and tendon sheath ganglia may click as the tendons slide over the mass.

Dorsal WristVolar WristFlexor SheathMucous Cyst

Dorsal wrist ganglion (60-70%). It arises from the dorsal capsule at the scapholunate ligament attachment, with its stalk penetrating between the fibres of the ligament. It presents as a firm, smooth, well-circumscribed swelling on the dorsum of the wrist, typically between EPL radially and EDC ulnarly, and usually 1-3 cm in diameter (range 0.5-4 cm).

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Symptoms and behaviour. It may be asymptomatic or cause vague wrist pain, typically worse with wrist extension, which increases pressure on the stalk. Its size may fluctuate with activity, larger after use. There is usually no joint instability, and wrist range of motion is typically normal, though the scapholunate interval may be tender.

The occult dorsal ganglion. Pain without a visible or palpable mass, with localised tenderness over the scapholunate ligament and pain on wrist extension. It may present as activity-related wrist pain or weakness, and it can be intraosseous, within the scaphoid or lunate. It requires imaging for diagnosis: high signal on T2 MRI, or ultrasound.

Volar wrist ganglion (18-20%). It typically arises from the volar capsule at the radioscaphoid or scaphotrapezial joint. The cyst lies in the "soft spot" at the volar radial wrist between the FCR tendon ulnarly and the radial artery radially, often deep to FCR, and this relationship is critical during surgical excision.

Features. A firm mass, typically 1-2 cm, that transilluminates and may show pulsation transmitted from the radial artery. Volar ganglia are more likely to be symptomatic than dorsal ones. A large one can compress the median nerve and cause carpal tunnel symptoms, although this is rare.

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Volar retinacular cyst (seed ganglion). It arises from the A1 or, less commonly, the A2 pulley at the base of the finger. It is a small (3-10 mm), very firm nodule in the distal palm at the MCP flexion crease, usually solitary and occasionally multiple.

Why it hurts. It is small but often symptomatic because space in the palm and fingers is confined, and it is exquisitely tender to palpation. It may cause triggering or locking of the digit, which the patient often describes as clicking or catching. Its size can make transillumination difficult.

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Differential diagnosis at the finger base.

• Trigger finger nodule (tendon nodule versus ganglion)
• Giant cell tumour of tendon sheath - solid, does not transilluminate
• Dupuytren nodule - in the palmar fascia, not tender
• Fibroma - solid, slow growing

Treatment. It often responds to aspiration because of its small size, and recurrence after excision is low. Excision requires careful dissection that protects the digital nerves and vessels, and the A1 pulley may need release if it contributes to the triggering.

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Mucous cyst (digital mucoid cyst). It arises from the DIP joint, typically in the setting of DIP osteoarthritis (Heberden nodes). DIP osteophytes create focal capsular weakness and mucin extrudes through the defect, often with osteophyte penetration; a stalk connects the cyst to the joint. It is a small (2-10 mm) translucent nodule on the dorsal finger between the DIP crease and the nail fold, most common in the long and index fingers, and it transilluminates with a bluish appearance.

The nail. Pressure on the nail matrix causes a longitudinal groove in the nail that corresponds to the position of the cyst, and chronic pressure leads to matrix damage. The cyst may also erode through the skin, occasionally rupturing with clear viscous drainage, and may become infected after rupture.

Treatment. Aspiration is often ineffective, with high recurrence. Excision removes the cyst and its stalk and debrides the DIP osteophytes, classically taught as essential to prevent recurrence; the capsule may need repair, and a local flap is occasionally required if the skin is thinned. An S-shaped dorsal incision exposes the DIP capsule, permits extensor-tendon protection and osteophyte debridement, and closes without sacrificing thin dorsal skin. Kanaya's series, in which dorsal capsulectomy alone left cyst and osteophytes intact with no recurrence at a mean of 26 months, challenges the need for routine osteophyte removal (see Controversies).

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Inspection. Note the location of the swelling (dorsal, volar or digital), its size, measured with calipers if available, and the skin (normal, thinned, previous scars). A longitudinal nail groove at a DIP swelling means a mucous cyst. Position matters: a dorsal ganglion is more prominent in wrist flexion, which pushes it dorsally, and a volar one in wrist extension, and a change in size with position supports the diagnosis.

Palpation. A ganglion is firm but fluctuant, neither rock hard nor soft, smooth and well circumscribed. It moves with the skin but is fixed to deep structures, and you cannot get above the lesion, which distinguishes it from a skin lesion. Note where it is tender and how much.

Transillumination is the most important diagnostic test. In a darkened room, place a bright LED penlight directly behind the mass: a true ganglion glows red-orange like a lantern because the fluid transmits light, while solid masses (giant cell tumour, lipoma, abscess) do not. This simple test differentiates cystic from solid with high accuracy.

The wrist. Range of motion is usually normal or minimally reduced, and pain may limit terminal flexion or extension; compare with the other side. Wrist extension may reproduce the pain of a dorsal ganglion and wrist flexion that of a volar one. Grip strength is often reduced by pain rather than true weakness.

Neurovascular. Check the radial and ulnar pulses, and perform an Allen test for a volar ganglion, which is essential before surgery. Test the median nerve (Tinel, Phalen) if compression is suspected, and ulnar nerve sensation and intrinsic function.

Intraosseous ganglion. It presents as bone pain, with tenderness over the scaphoid or lunate, where it is most common, and no palpable mass. The radiograph may show a lucent lesion within the bone, and MRI, showing high T2 signal within bone, confirms the diagnosis. In the case below, three-dimensional CT demonstrates communicating carpal bone defects across the scapholunate interval, distinguishing intraosseous extension from a purely soft-tissue ganglion, and MRI confirms fluid-signal lesions within the scaphoid and lunate and defines their extraosseous communication when radiographs show only lucency.

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A clinical diagnosis. Ganglion cysts are primarily a clinical diagnosis, and imaging is not required when the features are typical: a well-defined fluctuant mass in a typical location that transilluminates. That combination of location, transillumination and fluctuance has high diagnostic accuracy.

Radiographs are usually normal, because ganglia are soft tissue. They are taken to rule out bony pathology when the diagnosis is uncertain, to assess DIP osteoarthritis with a mucous cyst, and to evaluate an intraosseous ganglion. They may show:

• DIP osteophytes (mucous cyst)
• A cystic lucency in bone (intraosseous ganglion)
• Scapholunate widening if instability is present, which is unusual

Ultrasound is non-invasive, inexpensive and free of radiation, but operator dependent. It confirms the cystic nature of the lesion as a well-defined anechoic (fluid-filled) or hypoechoic mass, which may have internal septations and shows no internal vascularity on Doppler. It shows the stalk communicating with the joint or tendon sheath, is useful for the occult ganglion and can guide aspiration, but it is less useful for an intraosseous or deep ganglion.

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MRI is indicated for:

• The occult ganglion (pain without a palpable mass)
• An atypical presentation or location
• Failed conservative treatment
• Concern for an alternative diagnosis
• A suspected intraosseous ganglion

What MRI shows. The ganglion is well defined, low to intermediate on T1 (the same as muscle) and high on T2, following fluid, and very bright on T2 with fat saturation. The stalk may be visible connecting to the joint, and the surrounding tissue is normal, without oedema. Being acellular, a ganglion does not enhance with contrast; if it enhances, consider infection or a solid tumour.

A negative MRI. The high MRI sensitivity quoted in the table below is not what Borisch found for the occult ganglion: pre-operative MRI confirmed it in only 31 of 40 wrists. A negative MRI does not exclude the diagnosis when the clinical findings are classic.

Aspiration is diagnostic as well as therapeutic, and the gross appearance of the aspirate confirms the diagnosis: clear, colourless to pale yellow, thick and jelly-like, the consistency of hair gel or petroleum jelly. The fluid can be sent for cell count (acellular), cytology (scattered mesenchymal cells, no malignant features), and Gram stain and culture if infection is suspected. What comes out of the needle points to the diagnosis:

• Clear viscous mucin - ganglion
• Turbid fluid - infection
• Blood - trauma, solid tumour
• Chalky material - calcific tendinitis
• No fluid obtained - solid tumour (giant cell tumour, lipoma)

When imaging is mandatory.

• Pain without a palpable mass (occult ganglion)
• No transillumination (solid tumour)
• Atypical location or features
• Rapid growth (concern for malignancy)
• Atypical fluid on aspiration
• Recurrence after failed treatment, to evaluate for underlying pathology

Imaging is otherwise optional: for a patient who prefers confirmation, for medicolegal documentation, or for research or teaching.

Reading the table. A giant cell tumour of tendon sheath is also lobulated on ultrasound, and a lipoma moves with the skin. A pseudoaneurysm is pulsatile, and a ganglion may transmit the pulse.

Other lesions to consider.

• Synovial cyst - a true cyst with a synovial lining; rare in the wrist, more common in the spine, usually associated with arthritis
• Branchial cyst - congenital and rare, in the lateral neck; not in the wrist or hand
• Neuroma - painful, Tinel sign positive, along a nerve distribution, enhances on MRI
• Arteriovenous malformation - compressible and refills, thrill and bruit, may have skin changes
• Abscess - red, hot and tender, fluctuant but does not transilluminate (turbid), with systemic features (fever) and elevated inflammatory markers
• Rheumatoid nodule - with rheumatoid arthritis; firm, non-tender, over the extensor surface or pressure points
• DRUJ arthritis - caput ulna syndrome
• Intraosseous ganglion - see Clinical Examination

The decision. Dias found that neither excision nor aspiration gave significant long-term symptomatic benefit over no treatment, with symptom outcomes similar whether the ganglion was observed, aspirated or excised. Patient preference therefore genuinely drives the choice.

Conservative Management

ObservationAspirationSplinting

Watch and wait. Many ganglion cysts resolve without intervention, and observation is appropriate first-line management for the asymptomatic or minimally symptomatic ganglion. Head's meta-analysis found aspiration not significantly better than reassurance in cohort studies, and no reliable predictors of spontaneous resolution have been identified.

Counselling. Explain that the lump is benign (not cancer, not dangerous), may fluctuate in size with activity, can resolve completely without treatment, is safe to observe indefinitely, and can be treated if symptoms develop. No routine follow-up is required. Advise return if it enlarges, becomes painful or becomes cosmetically unacceptable, and consider imaging if its features change, to rule out other pathology.

The trade. Observation carries no risk of complications and no cost. The ganglion may persist or enlarge, with ongoing cosmetic concern and the psychological impact of a "lump".

Needle aspiration is an office-based procedure under local anaesthesia, simple and quick and giving immediate relief if the ganglion is symptomatic, but with a high recurrence rate.

1. Clean the skin with antiseptic
2. Local anaesthesia (1% lidocaine, optional)
3. An 18 or 20 gauge needle, because the mucin is thick
4. Enter the cyst from the side, not directly over the stalk
5. Aspirate the contents (clear, viscous, jelly-like)
6. Compress the cyst after aspiration
7. Apply a pressure dressing

Complete evacuation. Incomplete aspiration through a fine needle is a common cause of early recurrence, so a large-bore needle (18 gauge) is used and the cyst is milked and compressed to express all the mucin.

Disrupting the one-way valve. Recurrence is driven by the persistent stalk and its one-way valve, so several authors fenestrate the cyst wall and stalk with multiple needle passes (the "multiple puncture" technique) to break down the valve and encourage the cavity to scar down. This is reported to lower recurrence compared with a single aspiration, though the evidence remains limited.

After the procedure. A firm compression dressing and a short period of relative wrist rest or splinting keep the walls apposed while they adhere.

Steroid. Some surgeons inject 0.5-1 mL triamcinolone after aspiration, on the theory that it reduces inflammation and encourages stalk closure. It is controversial, with no strong evidence of benefit: trials have not shown a clear advantage over aspiration alone, and added corticosteroid is not proven to reduce recurrence.

Recurrence. 50-59% recur, most within 1-2 years, and in Head's cohort data aspiration was not significantly better than reassurance. Recurrence is lower if aspiration is complete, a pressure dressing is applied and the ganglion is dorsal rather than volar. Aspiration does not address the stalk, the source of the problem, and may need repeating: it can be repeated if the ganglion recurs, with no limit on the number of aspirations.

Realistic expectations. Even optimised aspiration recurs in a large minority, so it is best framed as a low-risk, repeatable, diagnostic-and-temporising option rather than a cure, and repeat aspiration is reasonable before offering excision.

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Wrist splinting is occasionally used for a dorsal wrist ganglion, but the evidence is limited. The rationale is that immobilisation may reduce the pumping of fluid into the cyst, with the wrist in neutral or slight extension, worn at night or with activities.

Where it stands. There are no high-quality studies; it has historical use but is falling out of favour, and it is not superior to observation or aspiration. It is not routinely recommended. It may offer symptom relief for activity-related pain, but it does not prevent recurrence or promote resolution.

Surgical Management

IndicationsDorsal Wrist TechniqueVolar Wrist TechniqueArthroscopic

Indications for excision.

1. Symptomatic ganglion causing pain or functional impairment
2. Failed conservative treatment (observation or aspiration)
3. Patient preference for definitive treatment
4. Recurrent ganglion after multiple aspirations
5. Diagnostic uncertainty (excision allows histology)
6. Neurovascular compression (rare - median nerve, ulnar artery)
7. Cosmetic concerns (patient preference)

Relative contraindications.

• Medical comorbidities increasing surgical risk
• Unrealistic patient expectations (must counsel about recurrence)
• Inability to comply with post-op restrictions
• Active infection at the surgical site

Timing. Excision is an elective procedure that can be delayed for the patient's convenience, with no urgency unless there is neurovascular compromise.

Preparation. Mark the ganglion with the patient awake, because it may be difficult to palpate, or disappear, under anaesthesia. Regional or general anaesthesia, tourniquet control, supine with the arm on a hand table, and loupe magnification.

Incision. Directly over the palpable ganglion, 2-3 cm long, either transverse along Langer lines for better cosmesis or longitudinal for better exposure, respecting the dorsal cutaneous nerve branches.

Dissection and excision.

1. Incise skin and subcutaneous tissue, protecting the dorsal cutaneous nerves (radial and ulnar branches)
2. Identify the ganglion (translucent, may be multilobulated) and develop a plane around it
3. The ganglion lies between EPL (radial) and EDC (ulnar); retract the tendons to expose it
4. Trace it to its stalk, which penetrates to the scapholunate ligament attachment
5. Excise the ganglion with its stalk and a 5 mm cuff of dorsal capsule - complete excision of the stalk to its capsular origin, and the cuff, reduce recurrence
6. Do NOT destabilise the scapholunate ligament
7. Check for satellite cysts, and inspect the joint capsule, repairing a large defect

Closure. Irrigate, secure haemostasis with bipolar cautery, close a large capsular defect and the subcutaneous tissue with 4-0 absorbable sutures and the skin with 5-0 nylon or a subcuticular suture, and apply a soft dressing.

Mnemonic

STALKDorsal Wrist Ganglion Surgical Technique

S

Scapholunate origin

Ganglion arises from SL ligament attachment

T

Transverse or longitudinal incision

Over palpable mass, respect Langer lines

A

Avoid EPL and EDC

Interval between EPL (radial) and EDC (ulnar)

L

Ligate or excise stalk completely

Trace to capsular origin at SL ligament

K

Keep capsular cuff with specimen

Excise 5mm cuff to reduce recurrence

Hook:STALK - what you must remove completely to prevent recurrence!

Preparation. The Allen test is mandatory to confirm dual circulation to the hand. Mark the radial pulse and the ganglion, and use regional or general anaesthesia with a tourniquet.

Incision. Longitudinal, 3-4 cm, along the volar radial wrist crease and centred over the ganglion.

Dissection and excision.

1. Incise skin and subcutaneous tissue, protecting the lateral antebrachial cutaneous nerve, which crosses radially, and the superficial radial nerve branches dorsally
2. Identify FCR and retract it ulnarly
3. Identify the radial artery, immediately lateral to the ganglion, and place vessel loops around it
4. The ganglion lies deep to FCR, between FCR and the radial artery; dissect it carefully off the artery
5. Trace the stalk to its origin on the volar capsule
6. Excise the ganglion with its stalk and a cuff of volar capsule; the cuff is harder to obtain than dorsally because of the depth

Critical anatomy.

• Radial artery - immediately adjacent (lateral); must be protected
• Superficial radial nerve - dorsoradial, easily injured
• Lateral antebrachial cutaneous nerve - crosses radially
• Median nerve - ulnar to the ganglion, usually safe

Closure. Irrigate, secure haemostasis, close the capsule if needed, then the subcutaneous tissue and skin, and apply a soft dressing.

Preventing Radial Artery Injury

For volar wrist ganglion excision:

1. Always perform Allen test preoperatively - confirm ulnar artery can supply hand
2. Use vessel loops around radial artery for retraction and protection
3. Use loupe magnification - artery small and fragile
4. Gentle dissection - avoid aggressive traction
5. Identify artery early - know where it is at all times
6. If injured: Apply pressure, vascular surgery consult, primary repair

Arthroscopic excision is an emerging technique for the dorsal wrist ganglion, resecting it from inside the joint. It requires arthroscopic skills.

Advantages.

• Smaller incisions (portals)
• Direct visualisation of the stalk origin
• The ability to address intra-articular pathology
• Potentially faster recovery
• Similar or lower recurrence than open excision

Technique.

1. Standard wrist arthroscopy portals (3-4, 6R)
2. Identify the ganglion stalk at the scapholunate ligament
3. Debride the stalk and a cuff of capsule with a shaver
4. Thermal shrinkage of the capsule
5. Ensure complete resection of the stalk

Evidence. Head's meta-analysis pooled recurrence at 6% arthroscopic against 21% open, and Clark and colleagues found 9.4% arthroscopic against 11.2% open across 1,670 cases. Portal placement carries a 1-2% risk of neuropraxia.

Limitations. A learning curve, the equipment required, and portal complications. Arthroscopic excision has also been applied to the volar ganglion, through a capsular window between the long radiolunate and radioscaphocapitate ligaments.

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Post-operative Care

The first two weeks. A soft dressing for comfort, elevation of the hand above the heart and immediate finger range of motion. Sutures come out at 10-14 days.

Two to six weeks. Progressive wrist range of motion and strengthening exercises, with return to light activities at 2 weeks and to heavy activities at 4-6 weeks. Scar massage helps cosmesis in the longer term, and the patient is monitored for recurrence.

How often, and why. Recurrence is the most common complication after excision: 21% pooled across surgical series, and 39% when patients were asked at a mean of six years. It usually appears within the first year. The commonest reason is an incompletely excised stalk or capsular origin, or, in a mucous cyst, unaddressed DIP osteophytes. Recurrence risk factors after excision:

• Incomplete stalk excision
• No capsular cuff removed
• Volar location (higher than dorsal), where the capsular cuff is harder to obtain

First, re-confirm the diagnosis. A recurrence after excision should prompt re-examination and usually imaging (ultrasound or MRI), to confirm a true recurrent ganglion rather than a different lesion (giant cell tumour, suture granuloma or a solid mass) and to define the stalk and capsular origin.

Revision is directed at the source. That means a wider excision of the capsular origin at the scapholunate ligament (dorsal) or the volar capsule, taking care not to destabilise the scapholunate ligament. It is harder through scarred tissue with distorted anatomy, raising the risk to the dorsal cutaneous nerves (dorsal) or the radial artery (volar). Arthroscopic revision is an option for dorsal recurrences, addressing the stalk and capsular window with less scar dissection.

Counselling. Re-recurrence rates are higher than after primary excision, and the patient must be counselled accordingly. Observation remains legitimate for a recurrent but only mildly symptomatic ganglion.

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After aspiration. Complications are minimal and aspiration is a very low-risk procedure.

• Infection - less than 1%, rare with aseptic technique; presents as cellulitis or abscess and is treated with antibiotics with or without drainage
• Nerve injury - rare, from inadvertent puncture, usually a temporary neuropraxia; avoided by identifying the anatomy
• Incomplete aspiration - when the mucin is too thick

Nerve injury after excision. Dorsally, the dorsal cutaneous branch of the radial nerve is the most commonly injured, or the dorsal cutaneous branch of the ulnar nerve, and injury presents as numbness over the dorsal hand or thumb. It is usually a neuropraxia that recovers in 3-6 months; permanent injury is rare, and it is avoided by identifying and protecting the nerves. Volarly the superficial radial nerve and the lateral antebrachial cutaneous nerve are at risk, and injury is more common than dorsally because of the nerves' proximity, with the same presentation and management.

Radial artery injury is a risk of volar ganglion excision: laceration with intraoperative bleeding, post-operative thrombosis, or a delayed pseudoaneurysm. A laceration is managed by primary repair with a vascular surgery consultation.

Other complications of excision.

• Tendon injury - EPL or EDC in dorsal excision, FCR in volar; rare with careful technique; primary repair
• Scar - hypertrophic or keloid, tender or cosmetically unacceptable; prevented by respecting Langer lines and careful closure; managed with massage, steroid injection or revision
• Stiffness - reduced wrist motion, usually mild and temporary; prevented by early mobilisation; managed with hand therapy and stretching
• Infection - superficial (cellulitis) or deep (abscess), risk less than 2%, higher with a mucous cyst because of DIP joint communication; antibiotics, with washout if deep
• Complex regional pain syndrome - rare (less than 1%); disproportionate pain, swelling and stiffness; managed with hand therapy, desensitisation and pain management

Mucous cyst complications.

• Nail deformity - the longitudinal groove may improve after excision but can persist through permanent nail matrix damage, so counsel the patient preoperatively
• Skin necrosis - the cyst thins the overlying skin, which risks necrosis after excision and may need local flap coverage
• DIP joint infection - if the cyst communicates with the joint, a higher risk than at other ganglion locations; antibiotics with or without washout

Ganglion cysts are the most common soft tissue mass of the hand and wrist worldwide, accounting for 50-70% of all hand and wrist soft tissue masses and the majority of referrals for a wrist lump in every healthcare system. Demographics are remarkably consistent across populations: female predominance (roughly 3:1), peak incidence in the 20-50 year range, and the dorsal wrist as the dominant location.

Why no registry exists: Unlike arthroplasty, ganglia are not implant procedures and are not captured by national joint registries (NJR, AJRR, AOANJRR, SHAR). The evidence base is therefore driven by RCTs, prospective cohorts (Dias 2007) and meta-analyses (Head 2015) rather than registry data. There is no dedicated society "guideline" with graded recommendations; practice is built on this primary literature plus instructional reviews (Thornburg, JAAOS).

High- vs limited-resource practice variation:

• Well-resourced settings: ready access to ultrasound and MRI for occult or atypical lesions; wrist arthroscopy offered as a minimally invasive option in specialist hand units.
• Limited-resource settings: diagnosis is almost entirely clinical (transillumination remains the single most valuable test where imaging is scarce); management favours reassurance and aspiration, with open excision when surgery is indicated because arthroscopic equipment and expertise are often unavailable.
• Universal principle: the diagnosis is clinical, imaging is selective rather than routine, and complete stalk-and-capsular-cuff excision is the determinant of low recurrence regardless of the resource setting.

Other unsettled questions:

• Role of the stalk in arthroscopy: Some authors argue meticulous stalk identification is unnecessary if an adequate capsular window is created (Borisch); others maintain stalk excision is the key to low recurrence (Thornburg). The two views are not fully reconciled.
• Negative MRI in occult ganglion: Imaging can be falsely negative; whether to operate on clinical grounds alone with a normal MRI remains a judgement call supported only by small series.
• Pathogenesis: The mucoid degeneration versus synovial herniation debate is still unresolved at a cellular level, though the one-way valve concept is broadly accepted clinically.