Vanishing Parotid Tumors on MR Imaging
| Autor: | Yusuke Tokuyasu, Yoshio Fujihara, Shu Nakamoto, Eiken Matsuda, Kazuhiko Nakamura, Toshihide Ogawa, Eiji Matsusue |
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| Rok vydání: | 2018 |
| Předmět: |
genetic structures
Adenoid cystic carcinoma 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine stomatognathic system parotid tumor medicine magnetic resonance imaging Effective diffusion coefficient Oncocytoma medicine.diagnostic_test business.industry Warthin Tumor Magnetic resonance imaging General Medicine oncocytoma medicine.disease vanishing humanities Hyperintensity Parotid gland stomatognathic diseases medicine.anatomical_structure 030220 oncology & carcinogenesis Original Article Warthin tumor Nuclear medicine business Diffusion MRI |
| Zdroj: | Yonago Acta Medica. 2018, 61(1), 33-39 |
| ISSN: | 1346-8049 |
| DOI: | 10.33160/yam.2018.03.005 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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