Surgery on a saccular vertebral artery-posterior inferior cerebellar artery aneurysm via the transcondylar fossa (supracondylar transjugular tubercle) approach or the transcondylar approach: surgical results and indications for using two different lateral skull base approaches - Matsushima, T; Matsukado, K; Natori, Y; Inamura, T; Hitotsumatsu, T; Fukui, M (J Neurosurg, 2001)