Home > Head > Cerebellopontine angle (CPA) lesion

Cerebellopontine angle (CPA) lesion

There are several kinds of tumour at Cerebellopontine angle (CPA), for example:
1.Acoustic schwannoma (neuroma): Isodense mass over the internal acoustic canal (lAC) forming an acute angle with the temporal bone (like an ice cream cone). Homogeneous enhancement. May contain necrosis, rarely calcified. If small (5-15 mm), it can be purely intracanalicular and visible only after contrast administration. The most common CPA mass (60% to 75%), typically seen in patients between 20 and 50 years of age. Arises from the glial-Schwann cell interface of the vestibular nerve. If schwannoma is bilateral. The patient has neurofibromatosis.
2.Meningioma:Isodense or hyperdense, strongly and uniformly enhancing mass. Broad dural base, obtuse angle with the temporal bone. Even if adjacent. not actually centered on the lAC. and the lAC is not widened. Hyperostosis of the adjacent temporal bone and/or calcification may occur. Second most common CPA mass(10%). Typical age: 30 to 60 years.
3.Epidermoid (congenital cholesteatoma):Homogeneously hypodense, irregular or lobulated nonenhancing CPA mass. Four to 5% of CPA mass lesions. Typical age: 20 to 50 years. Arises
from intracranial or intraosseous ectoderm inclusions. Found in the CPA as well as in the petrous temporal bone. Contains cholesterol or keratin debris
and some rare tumours:
4.Vertebrobasilar dolichoectasia
5.Nonacoustic sch”annoma (neuroma)
6.Paraganglioma (glomus juguIare)
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