Recurrence of aneurysmal bone cyst of the fourth metatarsal.

Aneurysmal bone cyst is a benign solitary lesion of unknown etiology. Its radiographic and histologic appearance can overlap with those tumors of malignant origin. It is imperative that clinical data, radiographs, and operative and pathological findings be correlated to ensure an accurate diagnosis. Aneurysmal bone cysts occur only 7% of the time in the foot. Recurrence rates are reported to be less than 12%. A case report of recurrence of aneurysmal bone cyst in the foot is reviewed, in addition to the etiology, differential diagnosis, and treatment alternatives.