Presentation
Painful left arm after a fall.
Patient Data
Age: 13
Gender: Male
From the case:
Unicameral bone cyst with fallen fragment sign
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There is a solitary lucent lesion in the proximal left humerus with an associated fracture and an osseous linear fragment in the dependent portion on the lateral aspect consistent with a fallen fragment sign of a unicameral bone cyst.
Case Discussion
The commonest location for a unicameral bone cyst is in the proximal humerus in 60% of the cases. The most frequent complication of the cyst is a pathological fracture as shown by the above case and is the commonest reason for presentation.
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