Benign neoplasm of cranial nerves [D33.3], Reason for Study: ^Reason: Brain tumor: Preop planning for resection History: headaches The scan was performed with multiple fiducial markers attached on the scalp.There is a large extra-axial mass on the left petrous apex with inhomogeneous enhancement.The mass is measured about 47.1mm(CC) x 35.7mm(RL) x 51.3mm(AP).The mass is centered at or around mesial skull base and eroding left petrous apex.The mass shows central non enhancing portion without evidence adjacent dural enhancement.The left cavernous sinus appears to be involved or completely pushed toward right side and the left cavernous sinus segment of the left ICA appears to be surrounded by the enhancing mass about 180-200 degree especially at the junction of petrous segment and posterior cavernous sinus segment.There is mass effects against brain stem, left cavernous sinus and left mesial temporal lobe.Differential diagnosis include left trigeminal nerve origin schwannoma or meningioma. There is no evidence of ventriculomegaly.The paranasal sinuses and mastoid air cells are clear.
Left petrous apex extra axial mass with inhomogenous enhancement as described above.Differential diagnosis include Schwannoma and meningioma.