颈动脉间隙肿瘤的MRI诊断

目的：探讨颈动脉间隙肿瘤的MRI影象特征及其病理、解剖学基础和诊断价值。材料和方法：分析25例颈动脉间隙肿瘤的MRI征象，并与手术病理或血管造影比较。结果：多数肿瘤的病理改变或血管造影的特征能在MRI图像上反映，囊变和含丰富粘液的神经源性肿瘤T2加权像呈边界光滑的极高信号，化学感受器瘤瘤内的血管表现为扭曲条状和圆点状的极低信号，颈内动脉瘤信号分层，转移瘤边界毛糙或不清；不同来源的肿瘤与颈内、外动脉或颈总动脉和颈内静脉的位置关系有解剖上的相关性，有利于准确的定位和鉴别诊断；25例中术前诊断正确22例（88％）。结论：MRI对颈动脉间隙肿瘤的定位和定性具有重要的诊断价值，结合病史可减少误诊。

MRI Diagnosis of Carotid Space Tumors

Purpose: To study the MRI features of the carotid space tumors and their pathologic changes and anatomical positions. Materials and methods: The characteristic appearances of MRI in 25 cases with carotid space tumors were analyzed, and compared with surgicalpathologic or angiographic findings. Results: The pathologic or angiographic findings could contribute to the MRI features. The schwannoma of cystic and mucoid degeneration had a fairly high on T2-weighted imaging. The many serpiginous and small circular low signals withinthe paraganglioma represented small vessels; The respective features of the anuerysm and metastasic carcinomas on the MRI also werefound. The relationship, which is imortant in differential diagnosis, between the great vessel and carotid space mass, was observed. Preoperative accuracy of MRI diagnosis was 88 %. Conclution: MRI is a useful methods in the location and nature of the tumors. The misdiagnosis will be decreaced in combination with case history and anatomical position of the masses.