Methods:All 27 cases of ACM were diagnosed by MRI and clinically confirmed by surgery. Among them,11 cases were male and 16 female,the patients ranged in age from 8 to 56 years(mean age 31 years).

• 方法:27例ACM均经MRI诊断、手术及临床证实,其中男性11例,女性16例,年龄8~56岁,平均31岁。