Mantle cell lymphoma of the lacrimal drainage system: A rare case and review of literature.

Mantle cell lymphoma (MCL) of the lacrimal sac is an exceptionally rare tumor with only four such cases reported in literature, to the best of authors' knowledge. The tumor is known to have extensive systemic and bone marrow involvement with poor prognosis and overall survival. The present case describes a 64-year-old male with primary MCL of the lacrimal drainage system, its diagnosis, and treatment options.