Classic IAC-CPA vestibular schwannoma. (A) Axial T2 and axial and (B and C) coronal T1 postcontrast images of an IAC-CPA VS, demonstrating the classic “ice-cream-on-cone” appearance with significant widening of the porus acusticus. Note the mass effect on the brainstem and partial effacement of the fourth ventricle.
Farid N. Imaging of vestibular schwannoma and other cerebellopontine angle tumors. Operative Techniques in Otolaryngology-Head and Neck Surgery. 2013;25(1):87-95. doi:https://doi.org/10.1016/j.otot.2013.11.011
Acoustic neuroma. These images are taken from an MRI of the internal auditory meati (IAMs) in a patient with right-sided sensorineural hearing loss. The image on the left is a thin-slice T2-weighted MR which shows the normal internal auditory canal (white arrow), containing the 7th and 8th cranial nerves (red arrow). However, on the right side the canal is filled by a soft tissue mass which is protruding through the meatus into the cerebellopontine angle (yellow arrow). On the right is a post-contrast T1-weighted fat-saturated image showing uniform enhancement of the mass, which has the typical ice-cream cone shape of an acoustic neuroma (vestibular schwannoma). When bilateral, these tumours are diagnostic of neurofibromatosis type 2.
Acoustic neuroma - Radiology at St. Vincent’s University Hospital. Radiology at St. Vincent’s University Hospital. Published 2025. Accessed June 12, 2025. http://www.svuhradiology.ie/case-study/acoustic-neuroma/