Retrospective review: usefulness of a number of imaging modalities including CT, MRI, technetium-99m pertechnetate scintigraphy, gallium-67 scintigraphy and F-18-FDG PET in the differentiation of benign from malignant parotid masses |
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Authors: | Ozawa Nozomi Okamura Terue Koyama Koichi Nakayama Keiko Kawabe Joji Shiomi Susumu Yamane Hideo Inoue Yuichi |
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Institution: | (1) Department of Radiology, Osaka City University Medical School, 1-5-7 Asahi-machi, Abenoku, 545-8585 Osaka, Japan;(2) Department of Nuclear Medicine, Osaka City University Medical School, 1-5-7 Asahi-machi, Abenoku, 545-8585 Osaka, Japan;(3) Department of Otolaryngology, Osaka City University Medical School, 1-5-7 Asahi-machi, Abeno-ku, 545-8585 Osaka, Japan |
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Abstract: | Objective The aim of this study is to evaluate an imaging approach using computed tomography (CT), magnetic resonance imaging (MRI),
technetium-99m pertechnetate scintigraphy (99mTc pertechnetate scintigraphy), gallium-67 scintigraphy (67Ga scintigraphy) and fluorine-18 fluorodeoxyglucose positron emission tomography (18F-FDG PET).
Material and Methods We reviewed retrospectively 59 patients with parotid masses. CT, MRI,67Ga scintigraphy,99mTc pertechnetate scintigraphy, and18F-FDG PET were performed.
Results All of the benign tumors had smooth margins on CT and MRI. Patients with inflammatory lesions and malignant lesions showed
well-defined margins or ill-defined margins. All Warthin's tumors showed high technetium accumulation. Many of malignant tumors
showed high FDG accumulation. Both pleomorphic adenomas and Warthin's tumors showed high accumulation in some cases on18F-FDG PET. Among 15 patients with pleomorphic adenoma, 14 patients showed marked hyperintensity relative to CSF on T2-weighted
images and partial enhancement on contrast-enhanced T1-weighted images. Combination of several imaging modarity offered usefulness
of differential diagnosis for parotid masses.
Conclusion An efficient combination of imaging methods may be helpul for achieve the correct diagnosis. |
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Keywords: | salivary glands computed tomography magnetic resonance imaging fluorine-18 fluorodeoxyglucose positron emission tomography |
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