This 24-years old man had pain in the left shoulder. The plain radiograph (Fig. 1) showed a well-defined osteolytic lesion with septae in the humeral epiphysis, with a narrow zone of transition. This appearance is consistent with a chondroblastoma. The MRI (Figs. 2, 3) showed a lesion with fluid-fluid levels. Such levels are common in aneurysmal bone cysts (ABC).
ABC transformation in a chondroblastoma is not uncommon and the presence of fluid-fluid levels should not prevent us from making a diagnosis of a chondroblastoma.
You can also see the other examples of a chondroblastoma in the tibial epiphysis and femoral head.
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