MONDO_0020646 (ocular adnexal lymphoma) is a non-Hodgkin lymphoma arising from the conjunctiva, lacrimal gland, lacrimal drainage apparatus, eyelids, or other orbital tissues around the eye. 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. Also known as: OAL, non-Hodgkin lymphoma of ocular adnexa, ocular adnexa non-Hodgkin lymphoma.