Complex carcinomas of the mammary gland in cats: pathological and immunohistochemical features.

Biphasic epithelial myoepithelial (complex) carcinomas of the feline mammary gland are rare. This article describes the pathological and immunohistochemical features and clinical outcome of eight cases of feline mammary carcinomas displaying complex morphology. This tumour type is a low grade malignancy that shows histopathological features distinctive from more common feline mammary carcinomas and from complex mammary carcinomas of dogs. It appears to have a better overall survival than other carcinomas of the mammary gland of cats.