Kakimoto Naoya, Gamoh Shoko, Tamaki Junko, Kishino Mitsunobu, Murakami Shumei, Furukawa Souhei
Department of Oral and Maxillofacial Radiology, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka 565-0871, Japan.
Eur J Radiol. 2009 Mar;69(3):464-72. doi: 10.1016/j.ejrad.2007.11.021. Epub 2008 Feb 21.
To investigate the CT and MR imaging features of pleomorphic adenoma in the head and neck area.
Our materials of this study consisted of 50 pleomorphic adenomas from 50 patients which were all histopathologically diagnosed. The CT and MR images were retrospectively evaluated. The following features were evaluated: the detectability of the lesion, the tumor margin, the border of the lesion, the aspect of the lesion, the contrast between the lesion and surrounding tissue, the signal intensity of the lesion, the enhancement of contrast medium, the aspect of the lesion after the injection of contrast medium, the detectability of the capsule, and the detectability of bone resorption of the lesion.
The tumor detectabilities were 77% on axial plain CT images and 90% on axial CE CT images, respectively. On CT images, pleomorphic adenoma tended to show a well-defined margin, a smooth border, an inhomogeneous aspect, a low or high contrast, and intermediate or high signal intensity. After contrast medium administration, pleomorphic adenoma tended to show a slightly high enhancement and either an inhomogeneous or a periphery enhancement on the CE CT images. The capsule could be hardly detected on CT images. The tumor detectabilities were 86% on axial T1-weighted MR images, 88% on axial T2-weighted MR images, and 85% on axial CE T1-weighted MR images, respectively. On MR images, pleomorphic adenomas tended to show well-defined margin, a lobulate border, an inhomogeneous aspect, a high contrast, and intermediate or high signal intensity. After contrast medium administration, pleomorphic adenoma tended to show a high enhancement and either an inhomogeneous or a periphery enhancement on MR images. The capsule could be detected in many cases on MR images.
It was possible to detect the capsule in pleomorphic adenoma using MR images. The pleomorphic adenomas in head and neck area should be evaluated with MR images.
探讨头颈部多形性腺瘤的CT和MR成像特征。
本研究材料包括50例经组织病理学诊断为多形性腺瘤的患者的50个肿瘤。对CT和MR图像进行回顾性评估。评估以下特征：病变的可检测性、肿瘤边缘、病变边界、病变形态、病变与周围组织的对比度、病变的信号强度、造影剂增强情况、注射造影剂后病变的形态、包膜的可检测性以及病变骨质吸收的可检测性。
轴位平扫CT图像上肿瘤的可检测率分别为77%，轴位增强CT图像上为90%。在CT图像上，多形性腺瘤往往表现为边界清晰、边缘光滑、形态不均匀、对比度低或高、信号强度中等或高。注射造影剂后，多形性腺瘤在增强CT图像上往往表现为轻度强化，强化不均匀或呈周边强化。CT图像上很难检测到包膜。轴位T1加权MR图像上肿瘤的可检测率为86%，轴位T2加权MR图像上为88%，轴位增强T1加权MR图像上为85%。在MR图像上，多形性腺瘤往往表现为边界清晰、边缘呈分叶状、形态不均匀、对比度高、信号强度中等或高。注射造影剂后，多形性腺瘤在MR图像上往往表现为强化明显，强化不均匀或呈周边强化。在MR图像上很多情况下可以检测到包膜。
利用MR图像可以检测多形性腺瘤的包膜。头颈部多形性腺瘤应采用MR图像进行评估。
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