We report a rare case of solitary metastasis to the retroperitoneum from the colon cancer and retrospective comparison of multiple CT examinations, resected curatively five years after the primary operation. A 66-year-old woman underwent right colectomy (partial resection) with D3 lymph node dissection for ascending colon cancer in November 2006. Final findings was moderately differentiated adenocarcinoma, pSS, pN2, cH0, cP0, cM0, fStage IIIb. Five years after the operation, a solitary tumor was pointed out in the right pararenal lesion of the retroperitoneal space on enhanced abdominal CT examination. However, this lesion was already present as a 4-mm nodule in the CT taken before the initial operation. The serum level of CEA had increased in accordance with the tumor growth. FDG positron emission tomography CT showed lesion accumulation of
18F-FDG. On a diagnosis of a solitary metastatic tumor from the colon cancer we performed curative resection of this tumor in November 2011 and the postoperative course was uneventful. The histopathological diagnosis was adenocarcinoma, compatible with metastasis of the colon cancer.
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