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目的 研究６０ 例经手术及病理证实的中脑肿瘤的影像学表现。方法 ６０ 例术前均行 Ｍ Ｒ 显像，手术全部或部分切除。结果 位于中脑顶盖被盖及导水管的肿瘤大多表现为边界比较清楚的异常信号，而丘脑起源累及中脑的肿瘤多为混杂 Ｔ１ 、 Ｔ２ 信号，边界不清。注射 Ｇｄ Ｄ Ｔ Ｐ Ａ 后，局限于中脑的肿瘤大多不增强。而丘脑起源侵及中脑及中脑向桥脑浸润生长的肿瘤多为不均匀混杂增强。结论 位于及累及中脑的肿瘤，生长部位不同，肿瘤性质不同，肿瘤的生物学性质又决定其生长形态，并表现出某些特殊的影像学特征。术前对 Ｍ Ｒ 表现作出正确分析很有意义。
Objective To study the imaging findings of 60 middle-brain tumors confirmed by surgery and pathology. Methods Sixty patients underwent preoperative M R imaging. All or partial resection was performed. Results Most of the tumors located in the capsular cap and the aqueduct of the midbrain showed relatively clear abnormal signals. However, the tumors involving the midbrain of the thalamic origin were mostly mixed T1 and T2 signals with unclear boundaries. After injection of Gd-D T P A, most of the tumors confined to the midbrain were not enhanced. The origin of the thalamic invasion of the brain and midbrain to the pontine infiltration of growth of tumors are mostly heterogeneous mixed enhanced. Conclusion The tumors located and involved in the midbrain have different tumor growth and different tumor types. The biological characteristics of the tumor determine their growth patterns and show some special imaging features. It is instructive to make a correct preoperative analysis of M R performance.