Extraskeletal osteoma in a cat

SUMMARY This paper describes a case of a benign osseous lesion which arose in the right front leg of an 8‐year‐old spayed female cat. The growth was situated in the dermal tissue above the olecranon, but not attached to it, and shelled out easily at surgery. While certain non‐neoplastic lesions, such as hamartomas or cases of heterotopic ossification, may appear histologically similar, the present case was considered to be a true tumour on the basis of the clinical, macroscopic and histological findings, and was termed an osteoma. The cat is remaining under observation, but there had been no recurrence 3½ months after surgery.