Primary colorectal follicular lymphoma in a Savannah cat

Lymphoma is one of the most common malignant neoplasms in cats. Historically, most feline lymphomas were associated with feline leukaemia virus infection, but due to routine vaccination against the virus, especially in developed countries, feline leukaemia virus‐associated cases are dramatically reduced in numbers. More recently, the most common lymphoma in cats is intestinal lymphoma, with most common type being the enteropathy‐associated T‐cell lymphomas. Follicular lymphoma is recognised in cats, but is very uncommon. Primary colorectal follicular lymphoma is rare in humans and has been reported in three dogs. In this case report, we describe a primary colorectal lymphoma with histological and immunohistochemical features of a follicular lymphoma in a Savannah cat. To the authors’ knowledge, this is the first case report of a primary colorectal follicular lymphoma in cats, and differential diagnosis of tumours in the colorectal area in cats should include follicular lymphoma.