A Small Rectal Neuroendocrine Tumor of Less Than 5mm with Lymph Node Metastasis

Shoji Kokubo, Shinobu Ohnuma, Hideyuki Suzuki, Hirofumi Imoto, Akihiro Yamamura, Hideaki Karasawa, Atsushi Kohyama, Takeshi Aoki, Kazuhiro Watanabe, Naoki Tanaka, Hiroaki Musha, Fuyuhiko Motoi, Takashi Kamei, Takeshi Naito, Michiaki Unno

研究成果: Article査読

抄録

According to the treatment guideline for rectal neuroendocrine tumor(NET), tumor with a diameter ofC10mm should be resected endoscopically, while tumor with a diameter of>10mm should be resected surgically with lymph node dissection. We experienced a case of a rectal NET with a diameter of 5mm with lymph node metastasis. A 69-year-old man underwent colonoscopy for positive fecal occult blood test. The colonoscopy revealed a submucosal tumor(SMT)with a diameter of 5 mm in the lower rectum. An endoscopic mucosal resection(EMR)was performed after SMT was diagnosed as NET by biopsy. Histopathological findings were NET-G1, 4.5×2.5 mm, v(+), ly(+). Then, laparoscopically assisted rectal resection with D2 lymph node dissection was performed. In histopathological examination, no tumor residue was observed in the specimu; however, a regional lymph node metastasis was detected. Risk factors of lymph node metastasis with rectal NET are a diameter of>10 mm, recessed or ulcerated surface, and lymphovascular invasion. However, we have to keep in mind that lymph node metastasis may occur even in small rectal NET with a diameter of ≤10mm.

本文言語English
ページ(範囲)1985-1987
ページ数3
ジャーナルGan to kagaku ryoho. Cancer & chemotherapy
45
13
出版ステータスPublished - 2018 12 1

ASJC Scopus subject areas

  • 腫瘍学
  • 癌研究

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