目的　回顾性分析颅内恶性畸胎瘤的影像表现。方法　搜集 15例经手术病理证实的颅内恶性畸胎瘤病人 ,分析其影像表现。本组 15例均行MR检查 ,8例同时进行了CT扫描。结果13例恶性畸胎瘤表现为边缘清楚的分叶状肿瘤 ,由实性部分和小囊变构成。平扫肿瘤呈混杂信号 ,肿瘤实质在T1WI表现为等信号 (6 / 13)或低信号 (7/ 13) ,T2 WI表现为等信号 (2 / 13)或高信号 (11/ 13) ,9例肿瘤T2 WI信号不均匀。 10例肿瘤内出现小囊变或坏死信号 ,囊变可为肿瘤任意位置的少量囊变 ,也可为多数囊变 ;3例无囊变。增强扫描 11例肿瘤呈不均匀强化 ,2例呈均匀强化。本组 2例鞍内型肿瘤信号均匀 ,未见囊变 ,沿漏斗侵犯下丘脑。CT扫描中 8例肿瘤内可见钙化影。本组肿瘤内未见脂肪成分。结论　颅内恶性畸胎瘤具有比较典型的影像学表现 ,正确诊断是可能的 Objective To retrospectively analyze the imaging manifestations of intracranial malignant teratoma. Methods Fifteen patients with intracranial malignant teratoma proved by surgery and pathology were collected and their imaging findings were analyzed. The group of 15 patients underwent MR examination, 8 patients underwent CT scan at the same time. Results Thirteen cases of malignant teratoma showed clear margin lobulated tumor, which consisted of solid part and small capsule. Tumors in the pancreas showed promiscuous signals. The tumors showed iso-signal (6/13) or low signal (7/13) at T1WI, and iso-signal (2/13) or high signal Tumor T2 WI signal is not uniform. 10 cases of tumor cystic lesion or necrosis signal, cystic change can be a small amount of tumor anywhere in the capsule, but also for the majority of cystic degeneration; 3 cases without cystic degeneration. Enhanced scan of 11 cases of tumor showed uneven enhancement, 2 cases showed uniform enhancement. The group of 2 cases of saddle tumor signal uniformity, no cystic change, infringement of the hypothalamus along the funnel. 8 cases of CT scan showed calcification in the tumor. No tumor in this group of fat composition. Conclusion Intracranial malignant teratoma has the typical imaging findings, the correct diagnosis is possible