Table 5. Comparative results with major surgical series of petroclival meningiomas.

Reference	N	Gross-total resection a (%)	Mortality (%)	Major morbidity (%)	New cranial nerve deficits (%)
Yasargil et al. 1	20	35	10	26	50
Mayberg and Simon 31	35	26	9	34	54
Nishimura et al. 32	24	63	8	33	91
Tatagiba et al. 4	54	70	2	24	37
Bricolo et al. 2	33	79	9	39	76
Spetzler et al. 33	18	78	0	11	39
Kawase et al. 3	42	76	0	12	36
Coudwell et al. 5	109	69	3.7	15	33
Zentner et al. 34	19	68	5	11	34
Goel 6	24	67	0	29	29
Abdel Aziz et al. 35	35	37	0	9	31
Little et al. 7	137	40	0.7	26	22
Park et al. 36	49	20	2	28.6	28.6
Mathiesen et al. 37	29	48	0	7	21
Natarajan et al. 8	150	32	0	22	20.3
Bambakidis et al. 9	46	43	0	41	30
Ramina et al. 10	67	55	3	12	33
Tahara et al. 38	15	50	13	20	50
Seifert 11	148	37	0	31	22
Li et al. 39	57	58	2	42	67
Yang et al. 40	41	61	0	66	8
Yamakami et al. 41	32	59	6	28	22
Watanabe et al. 42	26	42	0	15	15
Shi et al. 43	14	86	0	43	43
Chen et al. 12	82	56	5	44	39
Nanda et al. 13	50	28	6	44	32
Kusumi et al. 44	23	47	0	22	43
Matsui 45	15	67	0	27	27
Li et al. 14	259	52.5	1.2	54	54
Almefty et al. 15	64	64	8	25	39
Morisako et al. 46	60 (24/36) b	EOR 96.1/92.7 c	1.7	25	46.7
da Silva & de Freitas 47	8/16	87.5	0	37.5	37.5
Tatagiba et al. 4	29/87	66	0	24	34
Zhou et al. 48	24	33.3	0	20.8	37.5
Isolan et al., 2015	22	50	4.5	27.3	13.6

Data in bold correspond to the current study.

^aSimpson grades I, II, and III.

^b24 cases in the early group (1990–1999) and 36 cases in the late group (2000–2009).

^cExtent of resection (EOR) was calculated as follows: EOR(%) = (preoperative tumor volume − postoperative tumor volume)/preoperative tumor volume × 100.