File:Acoustic schwannoma - eroding petrous apex (Radiopaedia 39674-42005 Axial non-contrast 35).png

Summary:

• Radiopaedia case ID: 39674
• Image ID: 15871318
• Image stack position: 35/36
• Plane projection: Axial
• Aux modality: non-contrast
• Study description: CT Brain (post-operative)
• Study findings: Interval right partial mastoidectomy and temporal craniectomy noted with mild pneumocephalus, and small right cerebellopontine/para-pontine fluid collection with moderate mass effect displacing the right middle cerebellar peduncle and partially effacing the 4th ventricle. Subtle midline linear density superior to this may represent tiny extraaxial blood layering over the posterior falx cerebri. No any other evidence of a surgical site hemorrhage. Within the constraints of this study, there is evidence of hypo/mesotympanic posterior wall destruction and partial semicircular and cochlear resection. Conclusion: No significant early post-op complication identified
• Modality: CT
• System: Central Nervous System
• Findings: Large enhancing spherical mass at the right cerebellopontine angle, eroding the apex of the petrous bone, almost reaching the labyrinth. The tumor significantly indents the right pons and cerebellar hemisphere and mildly deviates the fourth ventricle to the left. No hydrocephalus. The right middle ear cavity and mastoid air cells are clear. A lipoma layers over the corpus callosum, which appears normal in size Small mucous retention cysts in in the maxillary sinuses.
• Published: 21st Sep 2015
• Source: https://radiopaedia.org/cases/acoustic-schwannoma-eroding-petrous-apex
• Author: Bruno Di Muzio
• Permission: http://creativecommons.org/licenses/by-nc-sa/3.0/

Licensing:

Attribution-NonCommercial-ShareAlike 3.0 Unported (CC BY-NC-SA 3.0)