Patient Data
Age: 50 years
Gender: Male
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Eccentric cystic expansion with thinning of cortices of the proximal phalanx of the big toe with fracture and "fallen leaf" sign (pathologic fracture with fallen cortical fragment in base of empty cyst is pathognomonic).
From the case:
Unicameral bone cyst of the big toe
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Fallen fragment sign.
Case Discussion
Unicameral bone cyst lesion is a non-neoplastic, serous fluid-filled bone lesion thought to result from temporary failure of medullary bone formation near the physis. Usually found in the proximal humerus of young patients and can be found in other locations including proximal femur, distal tibia, ilium, calcaneus, and occasionally metacarpals, phalanges, or distal radius arises in the metaphysis adjacent to physis and progresses toward the diaphysis with bone growth.
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