Imaging findings of sinus pericranii: A case report

Sinus pericranii is a rare vascular anomaly involving an abnormal communication between the extracranial and intracranial circulation. We presented the imaging findings of a case with sinus pericranii. A 25 year- old man presented with a soft mass in the forehead, which increased its size in a head down position. Plain radiography demonstrated focal irregular thinning of the frontal bone. Computed tomography and magnetic resonance imaging showed an abnormal extracranial vascular pooling in the frontal region with a suspicious communication with the underlying superior sagittal sinus (SSS), and the associated intracranial venous angioma. In cerebral angiography, no opacification of extracranial vascular lesion was seen and only venous angioma was confirmed. Direct percutaneous sinography well delineated the direct communication between the extracranial venous sac and the SSS. Although Sinus pericranii can be suggested by the clinical presentation, imaging studies are useful in showing the vascular nature of the lesion with communicating tracts to the SSS, as well as associated calvarial change and other anomalies.