Photographs and schematic drawings displaying the anatomic relationship among the CPA
epidermoid, trigeminal nerve, and the artery. First low : The trigeminal nerve is completely
encased by the epidermoid without displacement. Second low : During the operation, the
trigeminal nerve is found to be compressed and distorted by the tumor. Third low : After
tumor removal, the anterior inferior cerebellar artery (AICA), located on the same side of the
tumor in relation to the trigeminal nerve, is found to be compressing the nerve directly on its
ventrocaudal aspect, thus, the nerve is compressed by both the tumor and the artery on
same sides. Forth low : In this patient, microvascular decompression (MVD) of the trigeminal
nerve in addition to tumor removal was performed.
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