Cerebellopontine angle mass
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Cerebellopontine angle (CPA) masses frequently occur,many many of which are relatively specific for the region.
Classification
Cerebellopontine angle masses can be divided into four groups, based on imaging characteristics:
- enhancing mass
- mass with high T1 signal on MRI
- mass with CSF intensity/density
- other masses
Alternatively, a quick mnemonic to remember the common entities affecting the cerebellopontine angle (CPA) is AMEN or SAME.
Enhancing mass
- acoustic schwannoma: ~80% of CPA masses (most common by far)
- meningioma: ~10% of CPA masses (second mostcommon)
- trigeminal schwannoma
- facial nerve schwannoma
- ependymoma
- metastasis
High T1 signal mass
- haemorrhagic acoustic schwannoma
- neurenteric cyst: usually prepontine, but fluid may be proteinaceous and high on T1
- thrombosed berry aneurysm: often will have calcified rim, and haemosiderin staining
- white epidermoid: rare, and will restrict on DWI
- cerebellopontine angle lipoma: usually has the facial nerve and vestibulocochlear nerve coursing through it; will saturate on fat suppressed sequences
- ruptured intracranial dermoid: often multiple droplets, and original midline lesion can be often seen
CSF density mass
- epidermoid cyst: ~5% of CPA masses (third most common)
- arachnoid cyst
Other masses
Many other masses can present at or around the cerebellopontine angle. They include:
- primary melanocytic neoplasm
- neurosarcoidosis
- cholesterol granuloma
- paraganglioma
- petrous apicitis
- chondrosarcoma
- chordoma
- endolymphatic sac tumour
- pituitary adenoma
- brainstem glioma
- choroid plexus papilloma
- lymphoma
- haemangioblastoma
- ependymoma
- medulloblastoma
- DNET (dysembroblastic neuroepithelial tumour)
- ganglioglioma (rare 3)
-<p><strong><span style="line-height:1.6em">C</span></strong><strong style="line-height:1.6em">erebellopontine angle (CPA) masses</strong><span style="line-height:1.6em"> frequently occur, </span><span style="line-height:1.6em">many of which are relatively specific for the region. </span></p><h4><span style="line-height:1.6em">Classification</span></h4><p><a href="/articles/cerebellopontine-angle">Cerebellopontine angle</a> masses can be divided into four groups, based on imaging characteristics: </p><ol>- +<p><strong>C</strong><strong>erebellopontine angle (CPA) masses</strong> frequently occur, many of which are relatively specific for the region. </p><h4>Classification</h4><p><a href="/articles/cerebellopontine-angle">Cerebellopontine angle</a> masses can be divided into four groups, based on imaging characteristics: </p><ol>
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