Objective:To investigate the value of routine intraoperative ultrasound(IU)and intraoperative contrast-enhanced ultrasound(ICEUS)in the surgical treatment of brain tumors,and to explore the utilization of ICEUS for the removal of the remnants surrounding the resection cavity.Methods:In total,51 patients who underwent operations from 2012 to 2018 due to different tumors in the brain were included in this study.The clinical data were evaluated retrospectively.IU was performed in all patients,among which 28 patients underwent ICEUS.The effects of IU and ICEUS on tumor resection and recurrence were evaluated.Semiquantitative analysis was performed to compare ICEUS parameters of the brain tumor with those of the surrounding tissue.Results:In total,36 male and 15 female patients were included in this study.The average age was 43 years(range:14-68 years).The follow-up period was from 7 to 74 months(mean follow-up 32 months).IU was used in all patients,and no lesion was missed.Among them,28 patients underwent ICEUS.The rate of total removal of the ICEUS group(23/28,82％)was significantly higher than that of the IU group(11/23,48％)(P＜0.05).The recurrence rate of ICEUS and IU was 18％(5/23),and 22％(5/28),respectively,and the difference did not reach statistical significance(P＞0.05).The semiquantitative analysis showed that the intensity and the transit time of microbubbles reaching the lesions were significantly different from the intensity and the transit time of microbubbles reaching the surrounding tissue(P＜0.05)and reflected indirectly the volume and the speed of blood perfusion in the lesions was higher than those in the surrounding tissue.Conclusion:ICEUS is a useful tool in localizing and outlining brain lesions,especially for the resection of the hypervascular lesions in the brain.ICEUS could be more beneficial for identifying the remnants and improving the rate of total removal of these lesions than routine intraoperative ultrasound.