Prenatal MR imaging of dural sinus malformation: a case report.

Objective: To describe prenatal magnetic resonance imaging (MRI) findings of dural sinus malformation (DSM), a very rare, congenital form of dural arteriovenous shunt (DAVS), typically affecting newborns.

Methods: Ultrasound (US) and MRI were performed at 34 weeks' gestation, and the findings of these examinations were compared with postnatal MRI studies performed at 2 days and 1 month.

Results: US showed an anechoic, midline posterior fossa collection with irregular internal echodensities.