Benign Bone Lesions
An 8-year-old boy presents with arm pain after minor trauma during a fall. Radiographs show a well-defined, central, metaphyseal lytic lesion in the proximal humerus with thinned cortices and a pathological fracture. The lesion abuts the physis. There is no periosteal reaction or soft tissue mass. A fragment of cortical bone is noted lying within the dependent portion of the cyst. Regarding unicameral bone cyst:
Mark each as TRUE or FALSE
Unicameral bone cyst (UBC, also called simple bone cyst) is a benign, fluid-filled, unilocular lesio...
Radiographically, UBC appears as a central, well-defined, metaphyseal lytic lesion with thinned but ...
UBC is a malignant lesion requiring aggressive treatment; it primarily affects elderly patients; ecc...
Many UBCs present with pathological fracture; fractures may heal the cyst in 10-15% of cases (more c...
Active cysts (adjacent to physis) have higher recurrence rates (50-60%) compared to latent cysts (10...
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Click T (True) or F (False) for each option