Bizarre parosteal osteochondromatous proliferation of the second metatarsal bone (Nora's lesion).

Parosteal bone tumors involving the small bones of the hand and the foot are rare. Their clinical and imaging features may imitate other bone tumors, leading to incorrect diagnosis and management. Histological examination of the lesion will establish the correct diagnosis. Bizarre parosteal osteochondromatous proliferation was first described in 1983 by Nora et al.1 In a report of 35 Mayo Clinic cases, Nora et al1 described the histological structure of the lesion and classified it as benign tumor of bone. In a recent review of 150 bone tumors of the feet, Bakotic and Huvos2 found 3 cases of bizarre parosteal osteochondromatous proliferation accounting for roughly 2% of all bone tumors of the feet. This article reports a case of a 20year-old woman with a bizarre parosteal osteochondromatous proliferation of the second metatarsal of the left foot.