Bilateral iris mass as the first manifestation of NK cell lymphoma: A case report.

Introduction Natural killer (NK) cell lymphoma is a progressive non-Hodgkin's lymphoma with rare prevalence. Intraocular involvement of NK cell lymphoma is very rare, with only case reports to date. Case presentation Here, we report a case of intraocular involvement of NK cell lymphoma which was presented with bilateral uveitis, iris mass, and diffuse infiltration into the center nerve system (CNS), skin, and possibly myocardium. Conclusions Iris mass and uveitis which is not responsive to steroids may be ocular manifestations of intraocular lymphoma, such as NK cell lymphoma. Ophthalmological and systemic examinations should be required for early diagnosis and treatment.