Primary mesenteric neuroendocrine tumor that changed its internal composition from cystic to solid: a case report

Clin J Gastroenterol. 2017 Feb;10(1):18-22. doi: 10.1007/s12328-016-0695-y. Epub 2016 Dec 27.


Mesenteric neuroendocrine tumors are usually metastases originating from the small intestine; however, primary mesenteric cases are rare. We present an interesting case of a mesenteric neuroendocrine tumor that changed its internal composition from cystic to solid. A 72-year-old male visited our hospital because of epigastralgia 4 years earlier. A 25-mm tumor was recognized around the terminal duodenum on computed tomography and magnetic resonance imaging, and was diagnosed as a cystic lesion. Over the following 2 years, the tumor grew to 40 mm and its internal composition changed from cystic to solid. The lesion showed positive findings on fluorodeoxyglucose positron emission tomography. Upon laparotomy, a solid tumor was detected in the mesentery of the jejunum near the ligament of Treitz. The tumor was extracted without intestinal resection and was diagnosed as a low-grade neuroendocrine tumor after histopathological and immunohistochemical examination. One year has passed since the operation, and there has been no recurrence.

Keywords: Cystic tumor; FDG-PET; Mesentery; Neuroendocrine tumor.

Publication types

  • Case Reports

MeSH terms

  • Aged
  • Disease Progression
  • Fluorodeoxyglucose F18
  • Follow-Up Studies
  • Humans
  • Magnetic Resonance Imaging
  • Male
  • Mesentery*
  • Neuroendocrine Tumors / diagnostic imaging
  • Neuroendocrine Tumors / pathology*
  • Neuroendocrine Tumors / surgery
  • Peritoneal Neoplasms / diagnostic imaging
  • Peritoneal Neoplasms / pathology*
  • Peritoneal Neoplasms / surgery
  • Positron-Emission Tomography
  • Tomography, X-Ray Computed


  • Fluorodeoxyglucose F18