NCIt definition : 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.;