Cerebellopontine angle mass

Dr Craig Hacking and A.Prof Frank Gaillard et al.

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 an acoustic 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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Article information

rID: 1079
Section: Gamuts
Synonyms or Alternate Spellings:
  • CP angle mass
  • Lesions of the cerebellopontine angle
  • Cerebellopontine angle lesions
  • CPA mass
  • CPA lesion

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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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