Low Amyloid-PET Uptake in Iowa-Type Cerebral Amyloid Angiopathy with Cerebral Venous Thrombosis.

Hereditary cerebral amyloid angiopathies (CAA) are rare disorders of early onset and severe course. We describe a 47-year-old patient with Iowa-type amyloid precursor protein (APP) mutation-related hereditary CAA that manifested with concomitant lobar hemorrhage and venous sinus thrombosis. To analyze the cerebral amyloid-β burden, an amyloid-PET was performed, demonstrating low cortical retention except for the calcarine cortex. High amyloid retention was also found in the thalamus and pallidum. The co-occurrence of CAA and venous thrombosis has not been previously reported in Iowa CAA and its mechanism is yet to be elucidated. Low cortical florbetapir-PET uptake does not rule out CAA in young patients, who may benefit from genetic testing to reach diagnosis when suspicion is strong. [ABSTRACT FROM AUTHOR]