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oncology

Bone Tumor Biopsy Principles

advanced
6 min
28 marks
6 questions
Clinical Scenario
A 15-year-old boy is referred with a destructive lesion of the distal femur. Imaging shows a metaphyseal lesion with periosteal reaction and soft tissue mass, concerning for osteosarcoma. The referring orthopaedic surgeon asks about biopsy technique. You explain the critical importance of proper biopsy planning and technique to avoid compromising definitive surgical treatment.
Diagram illustrating biopsy principles for a distal femur bone tumor. The correct approach shows a longitudinal incision along the future surgical approach, entering a single compartment, avoiding neurovascular structures, and using a biopsy tract that can be excised en bloc with the tumor. The incorrect approach crosses compartments, uses a transverse incision, and contaminates multiple tissue planes.
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Diagram illustrating biopsy principles for a distal femur bone tumor. The correct approach shows a longitudinal incision along the future surgical approach, entering a single compartment, avoiding neurovascular structures, and using a biopsy tract that can be excised en bloc with the tumor. The incorrect approach crosses compartments, uses a transverse incision, and contaminates multiple tissue planes.

Image source: Open Access medical literature (NIH/PubMed Central) • CC-BY License

Questions

Question 1 (4 marks)

What are the fundamental principles of bone tumor biopsy?

Question 2 (5 marks)

Describe the technique for open biopsy.

Question 3 (6 marks)

Compare core needle biopsy and open biopsy.

Question 4 (5 marks)

What are the consequences of a poorly performed biopsy?

Question 5 (4 marks)

Discuss the role of imaging-guided biopsy.

Question 6 (4 marks)

What special considerations apply to specific locations?

Exam Day Cheat Sheet

Must Mention

  • •"Biopsy is the beginning of treatment"
  • •Specialist center or treating surgeon
  • •Longitudinal incision along future resection
  • •Single compartment, through muscle
  • •Avoid NV structures
  • •Meticulous hemostasis
  • •Mankin: 20% complications non-specialist

Common Pitfalls

  • •Transverse incision
  • •Crossing compartments
  • •Not planning with surgeon
  • •Excisional of large tumor
  • •Missing Mankin study
  • •Poor hemostasis