Primary extranodal marginal zone B-cell lymphoma with diffuse uveal involvement and focal infiltration of the trabecular meshwork: a case report and review of literature

Background: Primary extranodal marginal zone lymphoma (EMZL) of the uvea is a rare condition and diagnosis may be challenging. We aim to report the clinical, histopathologic and immunohistochemical findings in a case of primary EMZL with diffuse uveal involvement and focal infiltration of the trabecular meshwork. Case presentation: A 38-year-old male presented with 2-year progressive vision loss in the right eye. Fundus examination showed choroidal thickening with diffuse retinal pigment epithelium (RPE) changes and inferior exudative retinal detachment. Ultrasonography revealed low-reflective masses with diffuse thickening of the choroid involving the optic nerve and orbit. Despite treatment with steroids, his symptoms progressed over time. One year later, visual acuity of the right eye markedly decreased to no light perception and enucleation was performed. Histopathological findings revealed infiltrates of malignant cells in the choroid, iris, ciliary body and trabecular meshwork. Immunohistochemistry confirmed the diagnosis of primary uveal EMZL. Conclusions: This is the first case reporting primary EMZL diffusely involving the uvea with focal infiltration of the trabecular meshwork.