"Osteoclast-like' giant cells in a feline mammary carcinoma

The authors describe the first case of mammary carcinoma with 'osteoclast-like' giant cells (OGCs) in a cat. The histological, immunohistochemical and ultrastructural findings observed show many similarities between feline and human mammary carcinomas with OGCs and support the opinion that cats suffering from mammary carcinoma can represent a useful animal model for human disease.