Incidentally discovered a large smooth cystic structure seen within the left transverse sinus with smooth attenuation of the sinus lumen. It reflects a high T2 and low T1 signal with no contrast enhancement. Contrast-enhanced MRV confirmed the intraluminal origin and cystic non-enhancing nature of this lesion and ruled out venous sinus thrombus.
Bilateral maxillary retention cysts are incidentally noted.
The rest of the study is otherwise unremarkable.