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 IAM. They are associated with intravestibular lipomas and sensorineural hearing loss.
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
For a general discussion of the differential, refer to:
The differential for lesions with high T1 signal includes:
- 1. Truwit CL, Barkovich AJ. Pathogenesis of intracranial lipoma: an MR study in 42 patients. AJR Am J Roentgenol. 1990;155 (4): 855-64. AJR Am J Roentgenol (abstract) - Pubmed citation
- 2. Loevner LA. Case review, brain imaging. Mosby Inc. (1999) ISBN:032300430X. Read it at Google Books - Find it at Amazon
- 3. Dahlen RT, Johnson CE, Harnsberger HR et-al. CT and MR imaging characteristics of intravestibular lipoma. AJNR Am J Neuroradiol. 2002;23 (8): 1413-7. AJNR Am J Neuroradiol (full text) - Pubmed citation