Cerebellopontine angle mass

Last revised by Dr Mohamed Saber on 26 Oct 2020

Cerebellopontine angle (CPA) masses are relatively common. Although a diverse range of pathologies may be seen in this region, the most common by far is a vestibular schwannoma.

Pathology

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 is AMEN or SAME

Enhancing mass
High T1 signal mass
CSF density mass
Other masses

Many other masses can present at or around the cerebellopontine angle. They include:

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Cases and figures

  • Case 1: meningioma
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  • Case 2: acoustic schwannoma
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  • Case 3: trigeminal schwannoma
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  • Case 4: arachnoid cyst
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  • Case 5: epidermoid
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  • Case 6: lipoma
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  • Case 7: vestibular schwannoma
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  • Case 8: vestibular schwannoma
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  • Case 9: meningioma
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  • Case 10: arachnoid cyst - cerebellopontine angle
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  • Case 11: epidermoid cyst - cerebellopontine angle
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