2Almefly O, Fox J L, Smith R R. Petrosal approach for petroclival meningiomas[J], neurosurgery, 1988,22 :510-517.
3Kraatimenos GP, Crockard HA. The far lateral approach for ventrally placed foramen magnum and upper cervical spine tumours[J]. Br J Neurosurg, 1993,7:129-140.