[Abnormal (bizarre) paraostial osteochondromatous proliferation (Nora's disease)]

Bizarre paraostial osteochondromatous proliferation (BPOP) is a reactive process composed of bone and cartilage attached to the surface of a bone, the condition was first described by Nora et al. as a reactive proliferation involving small bones. A case of a 76-year-old male represents the first description of BPOP in the Russian literature. The patient has a history of trauma, the duration of symptoms being more than a year. Xray study shows suspected secondary chondrosarcoma. The benign space-occupying lesion BPOP is verified after wedge resection of the phalanx. The described condition seems to occur more frequently than reported in the literature. Current imaging techniques and histological study permit avoidance of diagnostic errors and correct choice of the scope of treatment.