Osteoblastoma in the Distal Humerus of a Cat

N. M. Kirk, M. D. Vieson, D. R. Sullivan, R. R. Pool

Research output: Contribution to journalArticle


A 7-year-old neutered male domestic shorthair cat was presented with chronic lameness in the right forelimb. A cystic bony lesion was identified in the distal right humerus and amputation was performed. The epiphyseal trabecular bones of the capitulum and trochlea was replaced by a tan to pink, expansile mass that was surrounded by a thin rim of cortical bone. Microscopically, the tumour was composed of a bland, osteoid producing spindle cell population within a well-vascularized fibrous stroma. Radiographical and histological features were consistent with osteoblastoma. Osteoblastoma and the related osteoid osteoma are uncommon, benign osteoblastic tumours that are reported rarely in animals. These tumours should be considered as differential diagnoses for slow growing, cystic bony lesions in cats.

Original languageEnglish (US)
Pages (from-to)27-30
Number of pages4
JournalJournal of Comparative Pathology
StatePublished - Oct 2019


  • benign bone tumour
  • cat
  • osteoblastoma
  • osteoid osteoma

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • veterinary(all)

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