Abstract:ObjectiveTo explore the correlation between preoperative MRI findings and postoperative residual of acoustic neuromas after surgery via retrosigmoid approach.MethodsClinical and MRI data of 124 patients suffering from acoustic neuroma surgically treated via retrosigmoid approach between May 2018 and Oct. 2018 in our department were analyzed retrospectively. Postoperative pathology confirmed acoustic neuroma in all the patients. All the patients were divided into groups with residual and without residual according to the postoperative examination results. The preoperative MRI findings included side and size of tumor, nature of tumor (cystic or solid), residual cerebrospinal fluid signal on T2WI, peripheral edema and compression of adjacent brain tissue. The correlations between the abovementioned MRI findings and postoperative residual were analyzed.ResultsUnivariate analysis showed that there were no significant differences between the two groups in patients’ gender and age, side and size as well as nature of tumor, compression of adjacent brain tissue (all P>0.05). There were significant differences between the two groups in cerebrospinal fluid signal and peripheral edema on T2WI of internal auditory canal (both P<0.05), which indicated that both were influencing factors of postoperative residual. Multivariate analysis showed that T2WI without CSF signal (OR=3.617, 95% CI=1.330-9.838, P=0.012) and presence of surrounding tissue edema (OR=0.293, 95% CI=0.111-0.774, P=0.013) were independent risk factors for postoperative residue.ConclusionsThe absence of CSF signal in the internal auditory canal and the presence of edema in surrounding tissues in preoperative MRI are independent risk factors for tumor residue. The above two points can be fully evaluated by preoperative imaging examination, and the corresponding surgical program can be formulated to reduce postoperative residue and improve the prognosis of patients.
