cerebellopontine angle lipoma

Cerebellopontine angle (CPA) lipomas account for ~10% of all intracranial lipomas.

Characteristically lipomas of the CPA have the facial nerve and vestibulocochlear nerve coursing through it on their way to the internal auditory canal. They are associated with intravestibular lipomas and sensorineural hearing loss.

Radiographic features

MRI

Signal characteristics are those of a lipoma:

• T1: high signal
• T2: high signal
• true FISP/FIESTA: low signal margin due to chemical shift artifact
• fat-saturated sequences: shows signal dropout

Differential diagnosis

For a general discussion of the differential, refer to:

• the generic article on intracranial lipomas
• differentials of a cerebellopontine angle mass

The differential for lesions with high T1 signal includes:

• hemorrhagic vestibular schwannoma
• neurenteric cyst
• thrombosed berry aneurysm
• white epidermoid
• ruptured intracranial dermoid

See also

• intracranial fat

Siehe auch:

• Lipom
• Tumor Kleinhirnbrückenwinkel
• intrakranielle Lipome
• Nervus facialis
• Nervus vestibulocochlearis
• neuroenterische Zyste
• Vestibularisschwannom
• white epidermoid
• sakkuläre zerebrale Aneurysmata
• lipomatöses Meningeom
• IAM

und weiter:

• Meningeom des Kleinhirnbrückenwinkels
• intrakranielle Lipome der hinteren Schädelgrube