A Case of Neuroendocrine Tumor Originating from the Mesentery of the Jejunum

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  • 空腸間膜原発神経内分泌腫瘍の1例
  • 症例 空腸間膜原発神経内分泌腫瘍の1例
  • ショウレイ クウチョウ カンマク ゲンパツ シンケイ ナイブンピ シュヨウ ノ 1レイ

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Abstract

Primary neuroendocrine tumor (NET) originating from the mesentery is extremely rare. We report a case of NET in the mesentery of the jejunum that was resected successfully. A 56-year-old woman was referred to our hospital because of an intra-abdominal mass in the left upper quadrant of her abdomen. Abdominal CT revealed a 3-cm, round tumor with heterogenous staining. MRI revealed a 4-cm tumor that showed low-signal intensity on T1-weighted imaging, and isosignal intensity on T2-weighted imaging and short inversion time inversion recovery imaging. Upper and lower gastroenterological examination showed no abnormal findings. We suspected that the tumor was a mesenchymal tumor in the abdomen. At the beginning of the surgery, the abdomen was searched laparoscopically and the tumor was found to originate from the mesentery of the jejunum. The tumor was resected without combined resection of the jejunum. Histopathological and immunohistochemical examinations revealed that the tumor was NET G1. Because recurrences and/or mestastases of NETs after long observational periods following the first operation have been reported, long-term, careful observations need to be performed periodically.

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