LUNG-CANCER WITH VISUAL-LOSS

A 58-year-old man with primary large cell carcinoma of the lung presen ted with rapidly progressive, bilateral visual loss. The patient was a lert and oriented, had no complaints of headache, and was found to hav e full ocular motility. The optic disks and fundi appeared normal. No visual pathway lesions or other CNS abnormalities were detected on neu ro-imaging. The authors discuss their differential diagnosis, clinical diagnostic approach, and subsequent management of this unusual patien t.