Mantle cell lymphoma in the sphenoid sinus showing acute bilateral blindness

A 57-year-old man was referred to our department with a mass in the sphenoid sinus. Surgical removal of the tumor was performed. However, a testicular mass was found that showed rapid growth. He had undergone inguinal orchiectomy. Five days after the urological surgery, he noticed visual disturbances and bilateral visual loss. Ophthalmological examination revealed total blindness, and magnetic resonance imaging revealed sphenoid mass growth. The patient underwent emergent removal of the tumor, and a diagnosis of malignant lymphoma was made. A final diagnosis of mantle cell lymphoma (MCL) in the testis and sphenoid sinus was made. After receiving treatment with intravenous corticosteroids and chemotherapy for lymphoma, his left vision completely recovered. Although his right vision was lost, he returned to normal social activities. This is the first report in the literature on MCL developing in the sphenoid sinus presenting with bilateral blindness and ipsilateral recovery.