Superficial siderosis of the central nervous system after ventriculoperitoneal shunt.

The authors report a case of superficial siderosis of the CNS that developed after ventriculoperitoneal (VP) shunt placement for normal-pressure hydrocephalus. A 65-year-old woman had undergone VP shunt insertion for normal-pressure hydrocephalus. Her gait disturbance, memory disturbance, and urinary incontinence all improved after the procedure. Two years later, however, her gait became ataxic and her appetite became poor. Brain MR imaging revealed a rim of hypointensity on T2-weighted sequences, enveloping the surface of the cortical fissure, cerebellum, and brainstem. Superficial siderosis of the CNS was diagnosed. Steroid administration improved her symptoms. The authors know of only one case of superficial siderosis developing after VP shunt surgery in the English-language literature. Superficial siderosis should be acknowledged as a possible complication of VP shunt.