Ocular Adnexal MALT Lymphoma in Association With Rosai-Dorfman Disease in a Child.

A 12-year-old boy presented with persistent proptosis and periorbital swelling after a school altercation. MRI revealed a mass in the right superonasal orbit extending along the orbital roof to the frontal bone and right frontal sinus, and intracranially to the dura of the right frontal lobe. Immunohistochemistry revealed CD20- and CD43-positive B cells consistent with a low-grade B-cell lymphoma.