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Table 2 Extension of tumors from the clival region into the adjacent anatomical regions

From: Endoscopic endonasal transclival removal of tumors of the clivus and anterior region of the posterior cranial fossa (results of surgical treatment of 140 patients)

Zone of adjacent extension of the tumor Number of cases Percent
Cavernous sinus (unilateral extension) 25 17.9
Turkish saddle 13 9.3
Parasellar region (bilateral extension into the cavernous sinuses) 12 8.6
Suprasellar region 20 14.3
Apex of the temporal bone pyramid 9 6.4
Cerebellopontine angle 8 5.7
Sphenoidal sinus 27 19.3
Nasopharynx 7 5.0
Oropharynx 3 2.1
Posterior ethmoidal air cells 4 2.9
Orbit region 2 1.4
Inner opening of the auditory tube 3 2.1
Temporal lobe, subcortical structures 4 2.9