 MRI: The exam is performed without IV contrast. There is no acute infarct, mass, or cerebral edema. The ventricles and basal cisterns are prominent for patient age. There is no midline shift or herniation. The skull and extracranial soft tissues are unremarkable. MRV: The superior sagittal sinus, inferior sagittal sinus, proximal transverse sinuses, straight sinus, vein of Galen, internal cerebral veins, and several visualized cortical veins are patent. Both distal transverse and sigmoid sinuses are suboptimally visualized, especially on the right which is likely artifactual. The right internal jugular vein is markedly thinned which is likely due to anatomic variation.
1.Artifactual and anatomic variation in both distal transverse and sigmoid sinuses contributing to suboptimal visualization of these structures on the venogram portion of the exam. Diminutive right internal jugular vein which is likely anatomic variation. Given absence of findings in the brain parenchyma, an acute thrombosis is felt to be unlikely, however if there remains high clinical suspicion, confirmation with CT venogram with IV contrast and/or repeat MR venogram with IV contrast would be suggested.2.Stable noncontrast MRI of the brain with no acute infarct, hydrocephalus or mass effect.