Cerebellopontine angle tumors in adults

Cerebellopontine angle tumors in adults are mainly benign and extra-axial. Magentic resonance imaging is the first method for their diagnosis, CT bein g more useful for bony structures evaluation. Vestibular schwannoma is the most common lesion, it presents as a rounded m ass centered along the axis of the internal acoustic meatus, the largest po rtion being in the cerebellopontine angle. The tumor enhances after Gadolin ium administration. Meningioma is the second most common tumor; this slow growing mass has a wi de attachment to the adjacent dural mater and is dramatically enhanced by c ontrast. Epidermoid cyst the third mass, is an extra-axial lesion with the signal is similar to the one of cerebrospinal fluid. Other lesions such as lipoma, papilloma, glioma or metastasis account for l ess than 1% of the cerbellopontine angle cistern tumors in adults.