Osteochondroma and Nora's lesion tumour characteristics. An osteochondroma is displayed in the X-ray (A). Microscopic analysis showed typical hyaline cartilage cup and growth plate-like bone proliferation (B). Most cases were found in phalangeal bones (30 cases) (C) and early in life, first two decades (D). Nora’s lesions can be identified in the radiographic image (E) and irregular periosteal chondro-osseous proliferation with no atypia (F). Nora’s lesions were most often found in the phalanges (G). Distribution of Nora’s lesions for gender and age is illustrated in part H.