This is an uncommon lesion that occurs most commonly in the proximal tibia or distal femur. The lesion is commonly seen in the 2nd and 3rd decades and presents as an expansile lesion with trabeculations, located in the metaphysis, extending into the diaphysis and sometimes the epiphysis. It is commonly mistaken for other tumors that present with trabeculations and expansion, such as aneurysmal bone cyst, giant cell tumor, desmoplastic fibroma and hemangioma.
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