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Clinical examination revealed a firm, non\u2010mobile protuberance on the craniomedial aspect of the left distal radius. Histological and radiographic findings were consistent with a solitary osteochondroma. Reoccurrence of clinical signs and acute increase in the mass size occurred 1.5\u2009years after diagnosis. A left forequarter amputation was performed due to concerns over malignant transformation. Histology was consistent with chondrosarcoma. Feline osteochondromas are rare, benign osseous neoplasms: they are classified as solitary, multiple or synovial. To the best of the authors' knowledge, this is the first reported case of malignant transformation of a solitary osteochondroma in a cat. 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