磁共振成像上消失的腮腺肿瘤
Vanishing Parotid Tumors on MR Imaging.
作者信息
Matsusue Eiji, Fujihara Yoshio, Matsuda Eiken, Tokuyasu Yusuke, Nakamoto Shu, Nakamura Kazuhiko, Ogawa Toshihide
机构信息
Department of Radiology, Tottori Prefectural Central Hospital, Tottori 680-0901, Japan.
†Department of Otorhinolaryngology, Tottori Prefectural Central Hospital, Tottori 680-0901, Japan.
出版信息
Yonago Acta Med. 2018 Mar 28;61(1):33-39. doi: 10.33160/yam.2018.03.005. eCollection 2018 Mar.
BACKGROUND
Of all parotid gland tumors, only oncocytoma has been reported to appear isointense to the parotid gland, namely vanishing, on fat-saturated T2 and T1 postcontrast gadolinium-enhanced magnetic resonance imaging (MRI). The purpose of this study was to evaluate vanishing of parotid tumors on conventional MRI with and/or without postcontrast gadolinium-enhancement and on diffusion weighted imaging (DWI).
METHODS
In 8 of 51 patients, ten parotid gland tumors had homogeneously enhanced lesions and were retrospectively analysed. Comparisons of signal intensity between those parotid tumors and parotid glands and evaluations of vanishing were performed on T1-weighted imaging (T1WI), T2-weighted imaging (T2WI), fat-suppressed T2WI (FS-T2WI), postcontrast gadolinium-enhanced T1WI (CE-T1WI) and fat-suppressed CE-T1WI (FS-CE-T1WI), DWI as well as apparent diffusion coefficient (ADC).
RESULTS
Ten parotid gland tumors consisted of five Warthin tumors, two pleomorphic adenomas, two parotid carcinomas (small cell carcinoma and adenoid cystic carcinoma) and one oncocytoma. All tumors showed hypointensity on T1WI and hyperintensity on DWI. Nine of ten tumors showed vanishing on the other MR sequences. All Warthin tumors showed vanishing on FS-T2WI, FS-CE-T1WI and the ADC map. One oncocytoma showed vanishing on FS-T2WI and the ADC map and hyperintensity on FS-CE-T1WI. All pleomorphic adenomas showed vanishing on T2WI and CE-T1WI. One adenoid cystic carcinoma showed vanishing only on CE-T1WI.
CONCLUSION
Vanishing of parotid tumors can be observed not only on FS-T2WI and FS-CE-T1WI but also on T2WI, CE-T1WI and ADC mapping.
背景
在所有腮腺肿瘤中，据报道只有嗜酸细胞瘤在脂肪饱和T2加权成像和T1加权钆增强磁共振成像（MRI）上表现为与腮腺等信号，即消失。本研究的目的是评估腮腺肿瘤在常规MRI（有和/或无钆增强）及扩散加权成像（DWI）上的消失情况。
方法
51例患者中有8例，共10个腮腺肿瘤有均匀强化病变，对其进行回顾性分析。在T1加权成像（T1WI）、T2加权成像（T2WI）、脂肪抑制T2WI（FS-T2WI）、钆增强T1WI（CE-T1WI）和脂肪抑制CE-T1WI（FS-CE-T1WI）、DWI以及表观扩散系数（ADC）上，对这些腮腺肿瘤与腮腺之间的信号强度进行比较，并评估肿瘤的消失情况。
结果
10个腮腺肿瘤包括5个沃辛瘤、2个多形性腺瘤、2个腮腺癌（小细胞癌和腺样囊性癌）和1个嗜酸细胞瘤。所有肿瘤在T1WI上呈低信号，在DWI上呈高信号。10个肿瘤中有9个在其他MR序列上表现为消失。所有沃辛瘤在FS-T2WI、FS-CE-T1WI和ADC图上均表现为消失。1个嗜酸细胞瘤在FS-T2WI和ADC图上表现为消失，在FS-CE-T1WI上呈高信号。所有多形性腺瘤在T2WI和CE-T1WI上表现为消失。1个腺样囊性癌仅在CE-T1WI上表现为消失。
结论
腮腺肿瘤的消失不仅可在FS-T2WI和FS-CE-T1WI上观察到，也可在T2WI、CE-T1WI和ADC图上观察到。
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