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  • Title: Isolated splenic metastasis of sigmoid colon cancer: a case report.
    Author: Okuyama T, Oya M, Ishikawa H.
    Journal: Jpn J Clin Oncol; 2001 Jul; 31(7):341-5. PubMed ID: 11518749.
    Abstract:
    We report the case of a 62-year-old man who developed isolated splenic metastasis of sigmoid colon cancer. The patient underwent left hemicolectomy for Dukes C sigmoid colon cancer in February 1997. In March 1999, an abdominal CT scan revealed a tumor 3 cm in size at the inferior pole of the spleen. The tumor was hyperechoic on ultrasonography. The serum carcinoembryonic antigen level was normal. Since no other site of recurrence was identified, a splenectomy was performed with a curative intent. At laparotomy, neither hepatic metastasis, peritoneal dissemination, lymph node metastasis nor local recurrence was detected. Histological findings of the splenic tumor were compatible with metastasis of the previously resected sigmoid colon adenocarcinoma. The patient has been disease-free for 19 postoperative months. Immunohistochemical staining for urokinase-type plasminogen activator was positive in primary sigmoid colon cancer and splenic metastasis, but negative in lymph node metastasis; results that possibly reflect the difference in progenitor cells between splenic metastasis and lymph node metastasis or the difference in the microenvironment of cancer cells between the spleen and lymph nodes. Based on the present case, we recommend that clinicians pay close attention to the spleen for the early diagnosis of isolated splenic metastasis when routinely evaluating abdominal CT scans and abdominal ultrasonography following curative resection of primary colorectal cancer.
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