Ocular Adnexal Non-Hodgkin Lymphoma

**Semantic type:** Neoplastic Process

**Definition:** A non-Hodgkin lymphoma that arises from the conjunctiva, lacrimal gland, lacrimal drainage apparatus, or eyelids. The vast majority of cases are extranodal marginal zone lymphomas of mucosa-associated lymphoid tissue. However, other histologic types of lymphomas can originate from ocular adnexal tissues, including rare cases of NK/T-cell lymphomas of nasal type.

**Synonyms:** - OAL - Ocular Adnexal Lymphoma - Primary Ocular Adnexal Lymphoma - Primary Ocular Adnexal Non-Hodgkin Lymphoma