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Cerebellopontine angle mass

Cerebellopontine angle (CPA) masses frequently occur, many of which are relatively specific for the region. 


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
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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