title: Primary mesenteric neuroendocrine tumor that changed its internal composition from cystic to solid: a case report.
abstract: 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.
authors.affiliation: Department of Surgery, Kariya Toyota General Hospital, 5-15, Sumiyoshi-cho, Kariya, Aichi, 448-8505, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Yasuda
authors.affiliation: Department of Surgery, Kariya Toyota General Hospital, 5-15, Sumiyoshi-cho, Kariya, Aichi, 448-8505, Japan. kitagami@phoenix-c.or.jp.
authors.forename: Hidehiko
authors.initials: H
authors.lastname: Kitagami
authors.affiliation: Department of Surgery, Kariya Toyota General Hospital, 5-15, Sumiyoshi-cho, Kariya, Aichi, 448-8505, Japan.
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Kondo
authors.affiliation: Department of Surgery, Kariya Toyota General Hospital, 5-15, Sumiyoshi-cho, Kariya, Aichi, 448-8505, Japan.
authors.forename: Keisuke
authors.initials: K
authors.lastname: Nonoyama
authors.affiliation: Department of Surgery, Kariya Toyota General Hospital, 5-15, Sumiyoshi-cho, Kariya, Aichi, 448-8505, Japan.
authors.forename: Kaori
authors.initials: K
authors.lastname: Watanabe
authors.affiliation: Department of Surgery, Kariya Toyota General Hospital, 5-15, Sumiyoshi-cho, Kariya, Aichi, 448-8505, Japan.
authors.forename: Shiro
authors.initials: S
authors.lastname: Fujihata
authors.affiliation: Department of Surgery, Kariya Toyota General Hospital, 5-15, Sumiyoshi-cho, Kariya, Aichi, 448-8505, Japan.
authors.forename: Hirotaka
authors.initials: H
authors.lastname: Miyai
authors.affiliation: Department of Surgery, Kariya Toyota General Hospital, 5-15, Sumiyoshi-cho, Kariya, Aichi, 448-8505, Japan.
authors.forename: Minoru
authors.initials: M
authors.lastname: Yamamoto
authors.affiliation: Department of Surgery, Kariya Toyota General Hospital, 5-15, Sumiyoshi-cho, Kariya, Aichi, 448-8505, Japan.
authors.forename: Yasunobu
authors.initials: Y
authors.lastname: Shimizu
authors.affiliation: Department of Surgery, Kariya Toyota General Hospital, 5-15, Sumiyoshi-cho, Kariya, Aichi, 448-8505, Japan.
authors.forename: Moritsugu
authors.initials: M
authors.lastname: Tanaka
mesh_terms: D000368:Aged; D018450:Disease Progression; D019788:Fluorodeoxyglucose F18; D005500:Follow-Up Studies; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008643:Mesentery; D018358:Neuroendocrine Tumors / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D010534:Peritoneal Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D049268:Positron-Emission Tomography; D014057:Tomography, X-Ray Computed
chemical_list: D019788:Fluorodeoxyglucose F18
keywords: Cystic tumor; FDG-PET; Mesentery; Neuroendocrine tumor