Multilobular tumour of bone with no abnormalities on plain radiography in a dog

A seven-year-old neutered female golden retriever was presented for an acut e onset of cervical pain and ataxia. Intervertebral disc disease or neoplas ia was suspected. There was no evidence of a soft tissue or bony mass on ph ysical examination or survey radiographs. Cerebrospinal fluid analysis did not show any evidence of a neoplastic process. Myelographic evaluation iden tified an extradural mass lesion extending from inside the calvarium to the mid-body of the first cervical vertebra. No additional diagnostic tests we re performed as the owners elected for euthanasia because of the high possi bility of a neoplastic, process with an accompanying poor prognosis. Multil obular tumour of bone was diagnosed on postmortem examination.