MRI vestibular schwannoma

This 30-year-old female presented with hearing loss on the right and has findings consistent with an acoustic neuroma on the following MRI images. The T1-weighted image without contrast (A) shows a mass centered in the right internal auditory canal (arrow). It is isointense to the brain parenchyma. Following gadolinium, the schwannoma enhances homogeneously and has the classic "ice cream cone" shape (short arrow). The high-resolution T2-weighted image shows loss of the normal fluid signal in the internal auditory canal, which can be appreciated on the left side. The mass (arrowhead; green overlay) projects into the cerebellopontine angle cistern (dashed arrow).