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Year : 2015  |  Volume : 14  |  Issue : 3  |  Page : 222-224

Lynch Syndrome Associated Colon Adenocarcinoma Resembling Lymphoma on Fluoro-Deoxyglucose-Positron Emission Tomography/Computed Tomography

1 Department of Radiology, University of California, San Francisco, CA 94143, USA
2 Department of Radiology, San Francisco VA Medical Center, San Francisco, CA 94121, USA

Correspondence Address:
Dr. Aung Zaw Win
Department of Radiology, San Francisco VA Medical Center, 4150 Clement Street, San Francisco, CA 94121
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DOI: 10.4103/1450-1147.161728

PMID: 26420998

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The patient was a 46-year-old Asian male diagnosed with lynch syndrome associated colon adenocarcinoma in the right ascending colon. A presurgical staging 18-fluoro-deoxyglucose-positron emission tomography/computed tomography (FDG-PET/CT) found increased metabolic activity in the cervical, axillary, mediastinal, supraclavicular, para-aortic and mesenteric lymph nodes. This pattern of metastasis was very unusual for lynch syndrome associated colon adenocarcinoma and the involvement of those lymph nodes resembles the pattern of spread of lymphoma. He underwent right hemicolectomy and he was subsequently treated with 12 cycles of folinic acid (leucovorin), fluorouracil (5-FU), irinotecan. A restaging FDG-PET/CT at the end of the chemotherapy showed interval decrease in size and metabolic activity in the affected lymph nodes. FDG-PET/CT is a useful imaging modality in following-up the treatment response in colon adenocarcinoma.

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