<unk>  <unk> , also known as Nora's lesion, is a type of non-cancerous bone tumor belonging to the group of cartilage tumors. It is generally seen in the tubular bones of the hands and feet, where it presents with a rapidly enlarging painless lump in a finger or toe. It is composed of bone, cartilage and spindle cells. Some people report previous trauma. Diagnosis is by medical imaging. Treatment is by surgical excision. Up to 50% recur after surgery. It is rare, and occurs more often in the 20s and 30s. Combined with subungal exostosis, it accounts for less than 5% of cartilage tumors. Males and females are affected equally. The condition was first described by Frederick E. Nora in 1983.
Bizarre parosteal osteochondromatous proliferation
Palisaded encapsulated neuroma
Terminal osseous dysplasia with pigmentary defects
Progressive osseous heteroplasia
Proliferating epidermoid cyst
Malignant chondroid syringoma
Intradermal spindle cell lipoma
Acral myxoinflammatory fibroblastic sarcoma