caa a22 4500 606246576 CHVBK 20210128101341.0 cr unu---uuuuu 210128e20150401xx s 000 0 eng 10.1007/s12262-015-1256-1 doi (NATIONALLICENCE)springer-10.1007/s12262-015-1256-1 Synchronous Collision Neuroendocrine Tumor and Rectal Adenocarcinoma: a Case Report [Elektronische Daten] [Jie-gao Zhu, Zhong-tao Zhang, Guo-cong Wu, Wei Han, Kang-li Wang] Collision tumors are thought to arise from the accidental meeting of two independent tumors. Adenocarcinoma is the most common malignant rectal tumor, while neuroendocrine tumor (NET) is relatively rare. Due to the endoscopy and reporting, the overall incidence of NETs was increasing recently but still less than 1 per 100,000. This means that a combination of an adenocarcinoma and NET is a very rare finding and an actual collision of these tumors even more so. We report here a highly unusual case of a 64-year-old woman who had collision tumors composed of a primary rectal adenocarcinoma and NET showing a "side by side” pattern. Resection margins are free of both the tumors. The postoperative course was uneventful. The patient underwent a protocol CT scan at 3months after surgery, which did not show any recurrence. Both the malignant adenocarcinoma and the NET would make a great influence in the rest lifetime and a follow up will be continued, although the CT did not show any recurrence until now. To the best of our knowledge, this is the first reported case of such an occurrence. Association of Surgeons of India, 2015 Collision tumor nationallicence Adenocarcinoma nationallicence Neuroendocrine tumor nationallicence Rectum nationallicence Zhu Jie-gao Department of General Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing, People's Republic of China aut Zhang Zhong-tao Department of General Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing, People's Republic of China aut Wu Guo-cong Department of General Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing, People's Republic of China aut Han Wei Department of General Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing, People's Republic of China aut Wang Kang-li Department of General Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing, People's Republic of China aut Indian Journal of Surgery Springer India 77(2015-04-01), 185-187 0972-2068 77<185 2015 77 12262 https://doi.org/10.1007/s12262-015-1256-1 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s12262-015-1256-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zhu Jie-gao Department of General Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing, People's Republic of China aut NATIONALLICENCE 700 1- Zhang Zhong-tao Department of General Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing, People's Republic of China aut NATIONALLICENCE 700 1- Wu Guo-cong Department of General Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing, People's Republic of China aut NATIONALLICENCE 700 1- Han Wei Department of General Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing, People's Republic of China aut NATIONALLICENCE 700 1- Wang Kang-li Department of General Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing, People's Republic of China aut NATIONALLICENCE 773 0- Indian Journal of Surgery Springer India 77(2015-04-01), 185-187 0972-2068 77<185 2015 77 12262