Objective To study the MR characteristics of atypical meningeoma and the benign meningioma at atypical location so as to deepen the understanding of them and improve the preoperative diagnosis accuracy. Methods Re-viewed 30 patients with benign meningionma in which 23 cases were atypical and 7 cases were of atpical location, which had been proved by operation and pathology examination. Observed the morphology, size, location, boundary, oedema of the tumour, relationgship between adjacent meninges, changes of the harnpans nearby and imageology fea-tures. Results In the atypical group, 23 cases were of clear boundaries, 14 cases were of irregularly lobulated, 15 cases appeared with uneven signal and obviously uneven strengthening, 2 cases were with coarse short tails, 1 case appeared that focus was absorded by local harnpan, 1 case appeared with local incrassated harnpan. And in the second group, there were 7 cases with clear boundaries. The focuses located in temporal lobe of left brain in 1 case, epencephalon in 1 case, pineal body in 1 case, trigonum of left brain and another of right in 1case respectively, and there were multiple focuses in 1 case and orbit in 1 case, mostly in which appeared to be material lump with equilong or longer T1 and T2, which were round, ellipse or lobulated, and were intensify equably. Conclusion Atypical meningeoma and the benign meningioma at atypical location present their own features respectively. Most of the atypical meningeoma and the be-nign meningioma at atypical location can be diagnosed qualitatively combining with clinical manifestation.%目的：探讨非典型表现及非典型部位良性脑膜瘤MR影像特点，以提高对其认识和术前的诊断准确率。方法回顾性分析30例经手术和病理证实的良性脑膜瘤，非典型MR表现23例，非典型部位7例，观察其形态、大小、部位、肿瘤边界、瘤周水肿、邻近脑膜关系、邻近颅骨改变及影像学特点。结果非典型表现良性脑膜瘤特点：23例均边界清晰；14例呈不规则、分叶状，15例表现为信号不均伴不均匀明显强化；粗短硬膜尾征病灶2例，病灶局部颅骨吸收1例，局部颅骨增厚1例。非典型部位良性脑膜瘤特点：7例均边界清晰；左侧脑室颞角1例，小脑1例，松果体区1例，左、右侧脑室三角区各1例，多发1例，眶内1例，大多呈等T1等T2或稍长T1、T2信号实质性肿块，信号均匀，呈圆形、类圆形或分叶状，强化均匀。结论各种非典型表现及非典型部位良性脑膜瘤的MR影像具有特征性，结合临床特征，大多数非典型表现及非典型部位良性脑膜瘤可作出定性诊断。
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