Tsushima Y, Matsumoto M, Endo K, Aihara T, Nakajima T
Department of Diagnostic Radiology and Nuclear Medicine, Gunma University Hospital, Japan.
Clin Radiol. 1994 Jul;49(7):485-9. doi: 10.1016/s0009-9260(05)81748-9.
The purpose of this study was to correlate the MR features and histological findings of pleomorphic adenomas, which are the most common tumour of the parotid gland, and to distinguish them from other types of tumour in the parotid gland. The materials studied consisted of 20 pleomorphic adenomas, including 12 untreated and eight recurrent cases, 17 other benign parotid tumours, and 12 malignant tumours. T1- and T2-weighted images and Gd-DTPA enhanced T1-weighted images were obtained. Characteristic bright signals with a higher intensity than that of CSF were seen in all of the pleomorphic adenomas on T2-weighted images, and were found to represent myxoid areas histologically. Although the cystic spaces in some benign tumours produced bright signals, these areas were distinguished from myxoid areas due to nonenhancement with Gd-DTPA. No bright signals were seen in the malignant tumours. In conclusion, bright signals on T2-weighted images represent myxoid tissue and are useful findings for diagnosing pleomorphic adenomas.
本研究的目的是关联多形性腺瘤（腮腺最常见的肿瘤）的磁共振成像（MR）特征与组织学发现，并将其与腮腺其他类型的肿瘤区分开来。所研究的材料包括20例多形性腺瘤，其中12例未经治疗，8例为复发病例，17例其他腮腺良性肿瘤，以及12例恶性肿瘤。获取了T1加权像、T2加权像以及钆喷酸葡胺（Gd-DTPA）增强T1加权像。在所有多形性腺瘤的T2加权像上均可见特征性的明亮信号，其强度高于脑脊液，组织学上发现这些信号代表黏液样区域。尽管一些良性肿瘤中的囊腔产生明亮信号，但由于Gd-DTPA增强扫描时这些区域无强化，故可与黏液样区域区分开来。恶性肿瘤中未见明亮信号。总之，T2加权像上的明亮信号代表黏液样组织，是诊断多形性腺瘤的有用表现。
