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Incidentally discovered large smooth cystic structure seen within the left transverse sinus with smooth attenuation of the sinus lumen. It reflects 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.