Presentation
Fall. Pain. Fracture?
Patient Data
Age: 8 years
Gender: Male
From the case:
Fallen fragment sign
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Displaced fracture through a mildly expansile lucent intramedullary lesion with a narrow zone of transition in the proximal humeral diaphysis.
A small fallen fragment lies in the dependent position of the lesion.
Case Discussion
A wide differential exists for lucent bone lesions, one of which is a simple (or unicameral) bone cyst.
This can result in a pathological fracture with the classical appearance being that of a fallen fragment when a small bone fragment 'sinks' into the dependent position of the cyst.
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