NCIt 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.;