 Multiple fiducial markers on scalp for the purpose of localization.There is 21.6mm x 23.5mm sized well circumscribed extra axial mass on the right CP angle extending into the left internal auditory canal. The mass demonstrated inhomogeneous low signal intensity on T2 images, low signal intensity on T1 images and showed intense enhancement on Gad infusion. The MR characteristics are consistent with vestibular schwannoma. The differential diagnosis include meningioma and facial nerve schwannoma. Brainstem at the level of middle cerebellar peduncle appears to be compressed due to mass, however, there is no abnormal brain parenchymal signal abnormality.Although the 4th ventricle also appears to be slightly deformed, there is no evidence of ventricular enlargement. The gray-white matter differentiation is normal. Normal flow voids are identified in the major intracranial vessels. The paranasal sinuses and mastoid air cells are clear.
1. Left CP angle tumor most likely left vestibular schwannoma with differential diagnosis of meningioma, facial nerve schwannoma and metastasis.2. Otherwise unremarkable.