Anal Lymphoma

**Semantic type:** Neoplastic Process

**Definition:** A usually large cell non-Hodgkin lymphoma of B-cell phenotype, arising from the anus. Lymphomas originating from the anal region are rare in the general population, but they are seen with a higher frequency in HIV-positive patients, particularly homosexual men.

**Synonyms:** - Lymphoma of Anus - Lymphoma of the Anus - Primary Anal Lymphoma