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Click A 48-year-old female with a left-sided intraosseous schwannoma of the petrous apex measuring 8.5 mm in the anteroposterior, 7 mm in the transverse, and 7 mm in the craniocaudal dimensions. Axial plain CT scan of the brain at the level of the petrous apex demonstrates a well-defined, smoothly marginated, lytic lesion with no internal matrix and no aggressive features located in the left petrous apex. (Protocol: 420 mAs, 140 kVp, 4.8 mm slice thickness).

Click A 48-year-old female with a left-sided intraosseous schwannoma of the petrous apex measuring 8.5 mm in the anteroposterior, 7 mm in the transverse, and 7 mm in the craniocaudal dimensions. Axial T2W fast spin echo fat saturation MRI of the brain at the level of the petrous apex demonstrates homogenous high signal and intraosseous location of the petrous apex lesion. (Protocol: Magnet strength 1.5 Tesla, TR 5310, TE 111, without contrast, 5 mm slice thickness).

Click A 48-year-old female with a left-sided intraosseous schwannoma of the petrous apex measuring 8.5 mm in the anteroposterior, 7 mm in the transverse, and 7 mm in the craniocaudal dimensions. Axial T1W high resolution fat saturation MRI of the brain pre gadolinium administration at the level of the petrous apex. The pre contrast image demonstrates the left petrous apex lesion, which is isointense to brain and demonstrates no involvement of the cranial nerves. (Protocol: Magnet strength 1.5 Tesla, TR 5.6, TE 2.8, without contrast, 1 mm slice thickness).

Click A 48-year-old female with a left-sided intraosseous schwannoma of the petrous apex measuring 8.5 mm in the anteroposterior, 7 mm in the transverse, and 7 mm in the craniocaudal dimensions. Axial T1W high resolution fat saturation MRI of the brain post gadolinium administration at the level of the petrous apex. The post contrast image demonstrates solid enhancement of the left petrous apex lesion. (Protocol: Magnet strength 1.5 Tesla, TR 5.6, TE 2.8, with 14 mL Multihance gadolinium, 1 mm slice thickness).

Click A 48-year-old female with a left-sided intraosseous schwannoma of the petrous apex measuring 8.5 mm in the anteroposterior, 7 mm in the transverse, and 7 mm in the craniocaudal dimensions. Coronal T1W high resolution fat saturation MRI pre gadolinium administration. The pre contrast image demonstrates the left petrous apex lesion, which is isointense to brain and demonstrates no involvement of the cranial nerves. (Protocol: Magnet strength 1.5 Tesla, TR 5.37, TE 2.54, 1 mm slice thickness).

Click A 48-year-old female with a left-sided intraosseous schwannoma of the petrous apex measuring 8.5 mm in the anteroposterior, 7 mm in the transverse, and 7 mm in the craniocaudal dimensions. Coronal T1W high resolution fat saturation MRI post gadolinium administration. The post contrast image demonstrates solid enhancement of the left petrous apex lesion. (Protocol: Magnet strength 1.5 Tesla, TR 5.37, TE 2.54, with 14 mL of Multihance gadolinium, 1 mm slice thickness).

Click A 48-year-old female with a left-sided intraosseous schwannoma of the petrous apex measuring 8.5 mm in the anteroposterior, 7 mm in the transverse, and 7 mm in the craniocaudal dimensions. DWI shows no area of high signal corresponding to the left petrous apex lesion. (Protocol: Magnet strength 1.5, TR 4200, TE 111, without contrast, 5 mm slice thickness).