The role of intraoperative ultrasound in gross total resection of brain mass lesions and outcome

Table 1 Study population criteria

Parameters	IOUS group		Conventional group		p
Parameters	N	%	N	%	p
Number (N)	332	53	300	47	0.1
Age
≤ 18y	84	25	76	25
> 18y	248	75	224	75
Range	3 months to 70 years		1–70 years
Mean	47 years		46 years		0.9
Sex
Male	215	65	198	66	0.8
Female	117	35	102	34	0.8
Pathology
Tumors	238	72	208	69	0.3
Hematoma	56	17	65	22	0.1
Abscess	38	11	27	9	0.4
Tumor types	238		208
Glioma	154	65	147	71	0.1
Metastatic	42	18	15	7	0.03
Medulloblastoma	22	9	28	13	0.07
Others	20	8	18	9	0.6
Location to tentorium cerebelli
Supratentorial	245	74	222	74
Infratentorial	87	26	78	26
Location to cortex
Cortical, and subcortical	96	29	100	33	0.3
Subcortical	236	71	200	67	0.3
Maximal diameter
≤ 5 cm	205	62	187	62
> 5 cm	127	38	113	38