2016 Volume 26 Issue 1 Pages 139-145
Adenocarcinomas are uncommon among sinonasal malignant tumors, which are usually squamous cell carcinomas. Intestinal-type adenocarcinomas （ITACs）, which histologically resemble colorectal adenocarcinomas, are rare among sinonasal malignant tumors, with a frequency of 4％. There are very few case reports of ITACs in Japan. Although a search of the global literature revealed that the 5-year survival rate of patients with ITACs is approximately 40％, 5 of the 6 ITAC patients treated at our hospital have survived for more than 5 years; the sixth patient has been observed for only 10 post-operative months. We herein report the clinical background, histopathological findings, treatments, and prognoses of these patients in order to compare the differences between Japanese patients with ITACs and patients from other countries.
