Seizure. MRI: There is high T1 signal extra-axial hemorrhage along the bilateral occipital and posterior cerebellar convexities, measuring up to 2 mm in thickness. There is no evidence of intracranial mass or acute infarct. The brain parenchyma appears unremarkable. The ventricles and basal cisterns are normal in size and configuration. There is no midline shift or herniation. The major cerebral flow voids are intact. The occipital calvarium is mildly depressed superiorly. The orbits, paranasal sinuses, and scalp soft tissues are grossly unremarkable.MRV: There is paucity of flow related enhancement in the posterior superior sagittal sinus inferior to the site of depressed occipital calvarium. There is hypoplasia of the right transverse sinus. There is otherwise no evidence of cerebral venous sinus thrombosis.
1. Subacute extra-axial hemorrhage along the bilateral occipital and posterior cerebellar convexities without significant mass effect.2. Paucity of flow related enhancement in the posterior superior sagittal sinus inferior to the site of depressed occipital calvarium, which is likely attributable to positional mass-effect. In addition, the right transverse sinus is hypoplastic. Otherwise, no evidence of cerebral venous sinus thrombosis.