Department of Radiology, McGill University Health Center, 1650 Cedar Ave, Suite C5 118, Montreal, QC, Canada H3G 1A4.
Radiographics. 2012 Jul-Aug;32(4):1047-64. doi: 10.1148/rg.324115180.
T2-weighted sequences are an integral part of magnetic resonance (MR) imaging performed for the characterization of adnexal lesions. A relatively small number of these lesions demonstrate low signal intensity on T2-weighted MR images. In the majority of cases, a specific diagnosis can be made by interpreting the signal intensity of the lesion with respect to certain pathologic correlates, including blood products, smooth muscle, fibrous tissue, and calcification, as well as high lesion cellularity. For example, lesions that are at least as dark as skeletal muscle are almost always benign, whereas those whose T2 signal intensity is higher than that of skeletal muscle constitute a more heterogeneous group composed of benign, borderline, and malignant disease entities. The authors propose a diagnostic algorithm that takes these features into account, as well as the appearances of the lesion with additional pulse sequences, to aid in the correct interpretation of T2-hypointense adnexal lesions. Knowledge of the anatomy, the T1-weighted imaging features, and the enhancement characteristics of adnexal lesions allows accurate characterization of these lesions, resulting in appropriate patient management.
T2 加权序列是用于描述附件病变的磁共振成像（MR）的一个组成部分。这些病变中只有相对较少的病变在 T2 加权 MR 图像上显示低信号强度。在大多数情况下，可以通过解释病变相对于某些病理相关性的信号强度来做出特定的诊断，包括血液产物、平滑肌、纤维组织和钙化以及高病变细胞密度。例如，至少与骨骼肌一样暗的病变几乎总是良性的，而 T2 信号强度高于骨骼肌的病变则构成了一个更具异质性的组，包括良性、交界性和恶性疾病实体。作者提出了一种诊断算法，该算法考虑了这些特征以及附加脉冲序列中病变的外观，以帮助正确解释 T2 低信号附件病变。了解附件病变的解剖结构、T1 加权成像特征和增强特征可准确描述这些病变，从而进行适当的患者管理。
