MRI features and pathologic types of benign meningiomas and their correlation with tumor recurrence

Abstract

Objective To determine MR manifestations and pathologic types of benign meningiomas and their relationship with tumor recurrence.Methods There were 218 patients (160 females,58 males; age range 4-79 years) with benign meningiomas in the study,including 31 recurrent meningiomas (recurrence group)and 187 primary meningiomas (primary group).All patients were proved by postoperative pathology.Differences of pathological types and MRI manifestations between the recurrence group and the primary group were evaluated by using x2 test and rank sum test.Logistic regression analysis was performed by taking tumor recurrence as the dependent variable,and age,gender,vital structures involvement and pathologic types as independent variables.The recurrent time intervals were compared by rank sum test.Results There were 30 patients with intracranial vital structures involvement or extreintracranial communication tumors in the recurrent group,which was obviously higher than that of the primary group (61 patients).The difference was statistically significant (x2 =57.672,P =0.001).The tumors located in the skull-base and juxtasinus in the recurrent group were obviously more than those in the primary group,and difference was statistically significant (x2 =10.990,P =0.001).Multi-logistic regression analysis showed that the recurrent risk of benign meningiomas was elevated significantly only with vital structure involvement or extre-intracranial communication tumors (wald x2 =31.863,OR =3.820,P =0.001).The recurrent risk of dural sinus involvement was 3.820 times of cerebral artery trunk and cranial nerves involvement,and the risk of the latter was 3.820 times of the non-involved.There was no statistical difference between the two groups in pathology type,location,peritumoral edema,tumor morphology and tumor size.The relapse time of dural sinus involvement and cerebral artery trunk involvement in the recurrent group was 24(13 to 180) and 126(12 to 187) months,respectively.There was significant difference (Z =2.197,P =0.028).Conclusions It is more common that the recurrent benign meningiomas located in the skull base and juxtasinus.The recurrent risk significantly increases when benign meningiomas with vital intracranial structure involved or with extra-intracranial communication tumor.The relapse time of dural sinus involvement is possibly shorter than that of cerebral artery trunk involvement.MRI plays an important role in predicting tumor recurrence and prognosis of benign meningiomas. Key words: Meningioma; Recurrence ; Pathology ; Magnetic resonance imaging