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F-18 FDG PET demonstration of a thyroid metastasis in a patient with colon cancer.

Iguchi T, Matsuoka J, Sato S, Okumura Y, Omori M, Mifune H, Akaki S, Kanazawa S

Department of Radiology, Okayama University Medical School, and Department of Radiology, PET-RI Center, Okayama Kyokuto Hospital, 567-1 Kurata, Okayama 703-8625, Japan. iguchi@cc.okayama-u.ac.jp

A 51-year-old man with a history of surgical removal of sigmoid colon cancer underwent F-18 fluorodeoxyglucose (FDG) positron emission tomography (PET) to search for distant metastases and/or local recurrence because the carcinoembryonic antigen level was elevated. F-18 FDG PET images showed increased focal FDG uptake in the left lobe of the thyroid. Computed tomography images showed thyroid tumor in the left lobe as well as F-18 FDG PET images. Thereafter he underwent thyroidectomy and the resected specimen was histopathlogically shown to have thyroid metastasis from colon cancer. F-18 FDG PET was useful to detect thyroid metastasis from colon cancer as well as the most frequently seen metastatic sites such as liver, lungs, and lymph nodes.

Published 24 April 2007 in Clin Nucl Med, 32(5): 361-2.
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