British Journal of Radiology (2009) 82, e3-e7
© 2009 British Institute of Radiology
doi: 10.1259/bjr/96087474
False-positive positron emission tomography appearance with 18F-fluorodeoxyglucose after definitive radiotherapy for cancer of the mobile tongue
Y ARIJI, DDS, PhD
N FUWA, MD, PhD
1
T KODAIRA, MD, PhD
1
H TACHIBANA, MD
1
T NAKAMURA, MD, PhD
1
Y SATOH, MD
1 and
E ARIJI, DDS, PhD
2
1 Department of Radiation Oncology, Aichi Cancer Center Hospital, 1-1 Kanokoden, Chikusa-ku, Nagoya 461-8681 and 2 Department of Oral and Maxillofacial Radiology, Aichi-Gakuin University School of Dentistry, 2-11 Suemori-dori, Chikusa-ku, Nagoya 464-8651, Japan

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Figure 1. (a) On the gadolinium-diethyltriaminepentaacetic acid (Gd-DTPA)-enhanced T1 weighted MR image before treatment, a relatively low-intensity area with peripheral enhancement is seen in the left side of the tongue. (b) Positron emission tomography (PET)–CT obtained 7 years and 3 months after treatment shows a high uptake area in the left side of the tongue. (c) Gd-DTPA-enhanced T1 weighted MR image obtained 3 weeks after the PET examination shows a slight increase in signal intensity in the left side of the tongue. (d) A T2 weighted MR image at the same time showed a decrease in signal intensity, indicating a fibrotic change.
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Figure 2. (a) On the gadolinium-diethyltriaminepentaacetic acid (Gd-DTPA)-enhanced T1 weighted MR image before treatment, peripheral enhancement is seen in the anterior portion of the tongue. (b) Positron emission tomography (PET) before treatment shows a high uptake area in the left side of the tongue, corresponding to the enhanced area on the T1 weighted MR image. (c) High uptake is observed on PET–CT obtained 3 years after treatment.
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Figure 3. (a) The gadolinium-diethyltriaminepentaacetic acid (Gd-DTPA)-enhanced T1 weighted MR image before treatment showed an enhanced tumour on the right side of the tongue. (b) On a Gd-DTPA-enhanced T1 weighted image taken 15 months after the end of treatment, a slightly high-intensity area is seen at the right side of the tongue. (c) Positron emission tomography (PET)–CT after treatment shows a high uptake area in the right side of the tongue.
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Copyright © 2009 by the British Institute of Radiology.