4Lalwani AK, Kaplan M J, Gutin PH. The transphenoethmoid approach to the sphenoid simus and clivus. Neurosurgery, 1992, 31:1008-1010.
5Carrau RL, Jho HD, KOY. Tansnasal- Transsphenoidal endoscopic surgery of the pituitary gland. Laryngoscope , 1996, 106 : 914- 918.
6Crockard HA, Steel T, Plowman N. A multidisplinary team approach to skull base chordomas. J Neurosurg, 2001, 95 : 175- 189.
7AL-Mefty O, Borba LA: Skull base chordoma: a management challenge. J Neurosurg , 1997,86 : 182-189.
8Sen CN, Sekhar LN, Schramm VL, et al. Chordoma and chondrosar coma of the cranial base: an 8-year experience. Neurosurgery , 1989,25:931-940.
9Cappabianca P, Cavallo LM, Colao A, et al. Endoscopic endonasal transspheenoidal approach : Outcome analysis of 100 consecutive procedures. Minim Invasive Neurosurg , 2002,45: 193 -200.
10Jho HD, Carrau RL, Mclaughlin MR, et al. Endoscopic transsphenoidal, resection of a large chordoma in posterior fossa. Act Neurochir, 1997,139:343-347.
