Primary lacrimal sac diffuse large B-cell lymphoma in a child.

We report the case of a 13-year-old boy who presented with a 2-month history of left eyelid swelling, ecchymosis, and epiphora. Magnetic resonance imaging revealed a lobulated lesion in the region of the left lacrimal sac extending to the left nasolacrimal duct. Biopsy revealed diffuse large B-cell lymphoma of the lacrimal sac. Chemotherapy was initiated, consisting of rituximab, methotrexate, cytarabine, doxorubicin, cyclophosphamide, and vincristine. The lesion resolved within weeks of treatment, and the patient remained disease free at 1 year. Primary orbital lymphoma is rare in children; primary diffuse large B-cell lymphoma of the lacrimal sac in a child has not been reported previously.