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We reviewed 9 cases of brainstem cavernomas and evaluated the approach for each lesion, accessibility, respectability, and pre- and post operative neurological status. The dorsal lesions were treated with posterior approaches, such as the occipital transtentorial approach or trans-4th ventricle approach. The ventral lesions were treated with anterior approaches using skull base technique, but we needed some technique to access ventral lesions. We used transposition of the cranial nerve and VA, which lay across the surface of the cavernomas in 2 cases, and we performed two-staged surgery in 1 case. In all cases, we were able to access and remove the lesions safely. Dorsal lesions with traditional posterior approaches and the ventral lesions require a skull-base approach and additional technique based on consideration of local anatomy and surrounding structures.
