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Slice 6 of 1
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XRMusculoskeletalConfirmedFRCR 2B
Unicameral bone cyst with fracture - humerus
Clinical Presentation
Child presenting with severe pain in arm following a minor fall.
- 1Two x-rays of the right humerus demonstrate a lucency within the proximal diaphysis with slight expansion and a fracture
- 2Lying medially within the cyst is a fragment of cortex
- 3The so-called fallen fragment sign is specific for a unicameral bone cyst, with a pathological fracture
- 4Part of the thinned cortex 'falls' into the cyst, thus indicating that the lucency is A) fluid B) uni-loculated
- 5Distribution of unicameral bone cysts
- 6Layout and distribution: Frank Gaillard 2012, Line drawing of skeleton: Patrick Lynch 2006, Creative Common NC-SA-BY