A Case of Multilobular Tumor of Bone in a Young Small Breed Dog

Abstract

A 2-year-old spayed female Maltese dog weighed 4.0 kg with a progressive paresis of the right forelimb, was referred to Veterinary Medical Center, the University of Tokyo for evaluation of a firm mass on the left calvarium. MRI images showed the mass grown into intra-cranium compressing the cerebrum. The mass was excised surgically and diagnosed as multilobular tumor of bone. The dog recovered rapidly after the operation, but the mass re-grew twice at the primary site and necessitated additional surgical interventions. The dog was treated with a radiation therapy just after the 3rd operation. Radiation therapy seemed to be effective for primary tumor control but the tumor had metastasized to the lung. Chemotherapy against metastasis was not effective and the dog was euthanized about 10 months after the first operation.