Feline Chondrosarcoma: A Retrospective Study of 67 Cats (1987–2005)

The histories of 67 cats diagnosed with chondrosarcoma (CSA) from 1987 to 2005 were reviewed. The mean age was 9.6 years, and males were 1.9 times more likely to be affected than females. Chondrosarcomas were diagnosed in the following sites: appendicular and axial skeleton, nasal cavity, facial bones, and extraskeletal sites. Of the 46 (70%) CSA associated with bone, 63% arose in long bones and 37% arose in flat bones. The remaining (30%) CSA arose in the subcutis. In cases available for follow-up (n=24), no definitive evidence of metastases was found. Cats that underwent radical surgical therapies were more likely to achieve long-term control or cure.

Multilobular tumour of bone of the thoracic wall in a cat

Multilobular tumour of bone is a rare neoplasm of the skull in middle-aged, medium-to-large breed dogs even if a few cases have also been described in cats and one horse. The aim of the present paper is to show both the computed-tomography features and the pathological findings of the above neoplasm affecting the thoracic wall of a cat. To the best of the authors' knowledge, such anomalous tumour localisation has never been reported and imaged in feline medicine.

Chondrosarcoma of the proximal humerus in a cat

Chondrosarcoma of the proximal humerus was diagnosed in a four-year-old, castrated male, domestic shorthair cat that was presented with a slowly growing solid mass in the region of the proximal humerus. Forequarter amputation was advised, but declined by the owners. Following surgical debulking clinical signs resolved, but two months after surgery the cat was readmitted because the mass had recurred in the same region. The forequarter was amputated. Histopathological evaluation of the tumour confirmed the diagnosis of chondrosarcoma. Follow-up examinations performed over a period of 15 months from initial presentation revealed that the cat was doing well and had no signs of metastatic disease. To the authors' knowledge, this is the first reported case of chondrosarcoma of the proximal humerus in a cat to be diagnosed and surgically treated. This case demonstrates that animals with such tumours may recover well after complete excision.

Common malignant musculoskeletal neoplasms of dogs and cats

Malignancies of the musculoskeletal system in dogs and cats can be categorized as either primary or metastatic within the bony or soft structures that comprise the musculoskeletal system. By far, the most common tumor that affects the musculoskeletal system in dogs is osteosarcoma. The most common tumors that affect the musculoskeletal system in cats are injection site sarcomas. These tumors are locally infiltrative; whereas up to 25% metastasize, most animals die from our inability to control local disease. The aim of this article is to provide a brief review of the biologic behavior of and treatment recommendations for common tumors of the musculoskeletal system, excluding the oral and nasal cavities.