MR imaging of maxillomandibular lesions

This paper addresses maxillomandibular lesions including cyst, tumor and osteomyelitis in terms of their general features and discusses the use of MR imaging techniques, interpretation of images and their characteristic findings. MR imaging of odontogenic keratocyst improved the visualization of a cystic pattern, regularly thin walls, weak enhancement of cyst walls and inhomogeneous intensity of fluid contents. However, some of them could be misdiagnosed as mixed or solid patterns by non-contrast study alone. Ameloblastoma showed mixed solid and cystic components, irregularly thick walls, papillary projections, and marked enhancement of the walls. In mandibular osteomyelitis, MR imaging could give us more detailed information regarding residual activity of infection and the extent of involvement. MR findings were suggestive to differentiate between tumors and cysts and characterize many cystic entities in the maxillomandibular region.     

涎腺恶性肿瘤的磁共振成像评价

作者报告２８例经病理检查证实的涎腺区恶性肿瘤的ＭＲＩ表现。通过将这些病变在ＳＥＴ２加权像和ＦＥ成像序列上的影像表现进行对比观察后认为（１）涎腺恶性肿瘤在Ｔ２加权像上的低，中等信号表现具有一定的特征性诊断意义；（２）作为一种有效的方法，ＦＥ序列成像能将肿瘤组织和在Ｔ２加权像上表现为低，中等信号的钙化和纤维组织予以区别，（３）涎腺肿瘤的所在部位和直径大小对其边缘表现和周围邻近正常组织有直接影响。