Lipochoristoma of the internal auditory canal
B. De Diego*, A. Trinidad*, A. Ibáñez*, G. Saucedo**, J. Vicente*, F. M González* and R. Ramírez-Camacho*
*Department of Otorhinolaryngology, **Department of Radiology, H. U. Puerta de Hierro-Majadahonda, Madrid, Spain
Lipochoristoma; choristoma; internal auditory canal mass; magnetic resonance imaging
295 - 297
Lipochoristoma of the internal auditory canal. Problem: Approximately 90% of tumours of cerebellopontine angle and internal auditory canal are vestibular schwannomas (acoustic neuromas) and meningiomas. Lipochoristomas are rare benign masses that represent only 0.15% of cases. Methodology: We report the case of a 39-year-old man who consulted us for right-sided hearing loss and tinnitus. Results: Tonal audiometry showed a down-sloping right sensorineural hearing loss in frequencies above 2000 Hz. Magnetic resonance imaging (MRI) revealed a heterogeneous lesion in the right internal auditory canal with areas of hyperintensity on noncontrast T1-weighted MRI and suppression of much of the signal of the lesion with persistence of some areas of enhancement on T1-weighted fat-suppressed images. Conclusion: Correct imaging diagnosis through MRI (high signal intensity on noncontrast T1-weighted images together with a missing signal in fat suppression sequences) is essential in order to avoid unnecessary surgery or radiation therapy, which are not recommended in the treatment of these lesions.
Vol. 8, 2012, 4th trimester

Lipochoristoma of the internal auditory canal