Presentation
Scalp swelling since birth
Patient Data
A midline high parietal subcutaneous soft tissue lesion is seen. It elicits faint bright T2/FLAIR and low T1 signals. This lesion shows internal hypointense signal and linear vascular signal voids on T2-weighted images.
On MRV: multiple venous channels are seen within the lesion on MR venography images, and small linear intra-cranial vessels are seen extending into the soft tissue lesion through the calvarium near the superior sagittal sinus.
MRA study: normal circle of Willis. However, the region of interest was not within the collimation of MR angiogram.
Case Discussion
Sinus pericranii is a vascular anomaly in which there is a transcranial communication between the intracranial venous sinuses and the extra-cranial venous system.
It usually presents as a soft, compressible, palpable mass that results from venous return through the abnormal communicating venous channels to the extra-cranial periosteum.