Table 3.

Details of the nonprophylactic-EVD group.

	Value	Preoperative hydrocephalus	Postoperative hydrocephalus	New Postoperative hydrocephalus
Benign	565(84%)	90(16%)	35(6%)	23(4%)
Malignant	110(16%)	46(42%)	12(11%)	1(1%)
Schwannoma	286(42%)	42(15%)	17(6%)	12(4%)
Meningoma	132(20.0%)	25(18.9%)	7(5.3%)	2(2%)
Hemangioblastoma	93(14%)	14(15%)	9(9%)	7(7%)
Glioma	59(9%)	18(31%)	9(15%)	1(2%)
Metastasis	29(4%)	9(31%)	1(3%)	0
Ependymoma	17(3%)	12(71%)	0	0
Cholesteatoma	17(3%)	1(6%)	0	0
Solitary fibrous tumor	12(2%)	1(8%)	0	0
Epidermoid cyst	9(1%)	1(11%)	0	0
Medulloblastoma	8(1%)	7(88%)	2(13%)	0
Choroid plexus papilloma	7(1%)	3(43%)	2(29%)	2(29%)
Arachnoid cyst	2(1%)	1(50%)	0	0
Lymphoma	2(1%)	1(50%)	0	0
Teratoma	2(1%)	1(50%)	0	0
Total	675	136(20.1%)	47(7.0%)	24(3.6%)

EVD, external ventricular drainage.