Metastasis of colon cancer to the thyroid gland is very rare and we would like to report a case we have experienced, with a review of the literature. A 66-year-old woman noticed a swelling in the anterior neck area and sought medical attention at our department in August 2003. At age 63, she had undergone surgery for cancer of the ascending colon, but subsequently the cancer metastasized to the liver and she underwent an outer hepatic segmentectomy. Fine-needle aspiration cytology indicated adenocarcinoma with characteristic tall columnar cells, confirming our suspicion that metastasis from the ascending colon cancer had already occurred. Furthermore, lung metastasis was also suspected, because several nodules were found in the lungs. On August 13, resection of the left lobe of the thyroid gland and dissection of the cervical lymph nodes were performed. Histopathology showed metastasis of the ascending colon cancer to the thyroid and lymph nodes.

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A 58-year-old man visited another hospital because of general fatigue and fever. He has never been abroad. CT revealed an area of hypoabsorption in the right lobe of the liver. Under a diagnosis of liver abscess antibiotic regimen was started, but no remission could be attained. The patient was referred to the department. On admission an increased leucocytes and impairment of the liver function were noted. CT revealed a huge hypoabsorbent area in the right lobe of the liver. Drainaging of the abscess and administration of antibiotics were started, however, no remission was obtained. As strong positive response to serum amebic antibody was observed, a diagnosis of amebic liver abscess was made. Antiamebic agents were administered. Unfortunately, severe jaundice and ARDS developed and the patient died of liver and respiratory failure on the 39th hospital day. These findings indicated that the patient had fluminating amebic liver abscess who might infected through some route in Japan. From this experience, we would emphasize the importance of early diagnosis and efficient prevention of complications. Some notes on relevant literature are also presented.