Vestibular Schwannoma

Clinical History: 
57 year old man with progressive hearing loss on the left side and sensory loss of cranial nerves V2 and V3.

Diagnosis:
Left vestibular schwannoma.

MR Technique: 
3 T scanner (Siemens Verio). Image 1: Axial T2 fast spin echo (TR/TE 6000/96 ms, scan time 1.26 min, slice thickness 4 mm); Image 2 : Axial T1 (TR/TE 350/2.5 ms, scan time 4 min 36 secs, slice thickness 3 mm); Image 3: Axial T1 fat suppressed after injection of 0.1 mmol/kg of gadolinium chelate; ( TR/TE 400/2.5 ms, scan time 5 min 14 secs, slice thickness 3 mm).

Imaging Findings:
The MR examination reveals a left CP angle mass with cystic and solid components measuring approximately 2.3 x 2.4 x 1. 3 cm (TR X AP X CC). The lesion is predominantly extracanalicular, with some intracanalicular extension, causing mild expansion of proximal internal auditory canal. The contralateral side is normal.