Normal sized posterior fossa.
Engorgement of the venous sinuses and cortical veins as a result of negative CSF pressure.
Herniated cerebellar tonsils through the foramen magnum by around 3 cm.
Right cerebellopontine angle (CPA) lesion with fluid instensity on T2WI indenting the pons and right cerebellar hemisphere. The pons is displaced to the left side and the left CPA cistern is obliterated. On FLAIR, the lesion's fluid signal is suppressed, confirming its CSF content. The lesion shows a bright signal on DWI, but high ADC values denote no diffusion restriction, ruling out epidermoid.