Cortical Venous Thrombosis Caused by Venous Compression by Arachnoid Cyst

Clinical problem: Identification, work-up and treatment approach of isolated cortical venous thrombosis (ICVT) in the absence of traditional risk factors.

Case presentation: A 66-year-old previously well male presenting with two episodes of left-sided spreading sensory symptoms, found to be secondary to ICVT from extrinsic compression by an arachnoid cyst.

Key teaching points: Early identification of structural abnormalities causing extrinsic venous compression and ICVT or cerebral venous sinus thrombosis (CVST) is important for alternative treatment options and to avoid unnecessary testing.