Question:

Which of the following is not a feature of petrous apex schwannomas?
1. Expansile.
2. Isointense T1W signal.
3. Hyper or hypo intense T2W signal.
4. Solid enhancement with gadolinium.
5. Infiltrates and fragments bone.





Answer:

The correct answer for the question "Which of the following is not a feature of petrous apex schwannomas?" is:

5. Infiltrates and fragments bone.



Explanation
1. Petrous apex schwannomas appear expansile on CT. [CT accurately defines the anatomic extent of the lesions and proximity to or invasion of bony structures such as the internal auditory canal or internal carotid canal... CT demonstrates an expansile, minimally erosive, isodense lesion].

2. Petrous apex schwannomas demonstrate isointense T1W signal. [On MRI, petrous apex schwannomas are T1W isointense, enhancing, with high or low T2W signal].

3. T2W signal can be hyper or hypo intense in petrous apex schwannomas. [On MRI, petrous apex schwannomas are T1W isointense, enhancing, with high or low T2W signal].

4. Petrous apex schwannomas demonstrate solid enhancement. [On MRI, petrous apex schwannomas are T1W isointense, enhancing, with high or low T2W signal].

5. Petrous apex schwannomas are benign lesions, which are minimally erosive. Conversely, chondrosarcoma is malignant and readily infiltrates bone as seen on CT. [On CT, however, it (chondrosarcoma) can be seen infiltrating bone with eroded fragments left behind].



From the manuscript:
Intraosseous Schwannoma of the Petrous Apex
Radiology Case. 2011 Nov; 5(11):8-16


This article belongs to the Neuro section.




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From the manuscript

Intraosseous Schwannoma of the Petrous Apex

Free full text article: Intraosseous Schwannoma of the Petrous Apex

Abstract
Primary neoplasms of the petrous apex are rare and include eosinophilic granuloma, chondroma, chondrosarcoma, chordoma, and schwannoma. We report just the second published case of an intraosseous schwannoma of the petrous apex and are the first to describe the entity using magnetic resonance imaging. By studying the computed tomography and magnetic resonance imaging features of this rare tumor, it is possible to suggest the diagnosis preoperatively.






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