Leukoencephalopathy-related cerebral amyloid angiopathy with cystatin C deposition.

Background We have described sporadic cases of cerebral amyloid angiopathy with cerebral hemorrhage showing a low cystatin C level in the cerebrospinal fluid detected by enzyme-linked immunosorbent assay. Recently, several cases of leukoencephalopathy in patients with cerebral amyloid angiopathy have been reported. We describe a sporadic case of leukoencephalopathy with cystatin C-type cerebral amyloid angiopathy diagnosed during life by enzyme-linked immunosorbent assay. Case Description A 74-year-old man who had suffered from progressive dementia for 3 years was admitted with right hemiparesis, dysarthria, and ataxia. MRI revealed pontine infarction and multiple lacunar state with leukoaraiosis. We suspected cystatin C-type cerebral amyloid angiopathy because of the low level of cystatin C in the cerebrospinal fluid. The patient died of sepsis 3 months later, and the presence of leukoencephalopathy with cerebral amyloid angiopathy was confirmed by autopsy. Immunohistological examination disclosed cystat...