小脑占位性病变的MRI诊断

目的评价MRI对小脑占位性病变的诊断能力。方法经手术病理证实资料完整的小脑占位性病变26例，恶性肿瘤11例，良性占位性病变15例，均经MRI平扫与增强扫描检查。结果本组中MRI正确诊断良性病变12例，恶性病变9例，定位准确率96．1％，敏感性为81．8％，特异性80％，准确性80．8％，阳性预测值75％，阴性预测值85．7％。结论MRI对该区占位性病变的诊断和鉴别诊断有重要价值。

MRI diagnosis of cerebellar space-occupying lesions

Objective To assess the capability of MRI for diagnosing cerebellar space - occupying lesions. Methods Twenty - six patients with surgically and pathologically proved cerebellar space- occupying lesions which comprised 11 malignant tumors and 15 benign lesions underwent MRI examinations without and with contrast enhancement. Results MRI correctly diagnosed 12 cases of benign lesions and 9 cases of malignant tumors in all patients. The accuracy of localized diagnosis was 96. 1% in the group. The sensitivity, specificity, accuracy, positive predictive value, and negative predictive value of MRI for detecting cerebellar space - occupying lesions were $1.8%, 80.0%, 80.8%, 75.0% and 85.7%, respectively. Conclusion MRI has high potency in the diagnosis and differential diagnosis of cerebellar space - occupying lesions.