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Related Experiment Video

Updated: Jan 18, 2026

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[Primary Rectal Mesenteric Neuroendocrine Tumor G2-A Case Report].

Takashi Takenoya1, Kenichi Suzuki, Miho Kawaida

  • 1Dept. of Surgery, Ogikubo Hospital.

Gan to Kagaku Ryoho. Cancer & Chemotherapy
|January 17, 2026
PubMed
Summary
This summary is machine-generated.

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A rare, slow-growing neuroendocrine tumor (NET) was incidentally found in the mesorectum of an 81-year-old man. Surgical resection led to a recurrence-free outcome, highlighting NETs in mesenteric tumor differential diagnoses.

Area of Science:

  • Gastroenterology
  • Surgical Oncology
  • Radiology

Background:

  • Neuroendocrine tumors (NETs) are rare neoplasms.
  • Mesenteric tumors can present diagnostic challenges.
  • Appendicitis can lead to incidental findings of other abdominal pathologies.

Purpose of the Study:

  • To report a rare case of a primary mesenteric neuroendocrine tumor.
  • To discuss the diagnostic and management challenges of mesenteric NETs.
  • To emphasize the importance of considering mesenteric NETs in differential diagnosis.

Main Methods:

  • Computed tomography (CT) for initial mass detection.
  • Colonoscopy and endoscopic ultrasound-guided fine-needle aspiration for characterization.
  • Retrospective review of prior imaging.

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  • Laparoscopic low anterior resection for tumor removal.

    • Main Results:

    • An 81-year-old male presented with appendicitis and an incidentally discovered 53-mm left mesenteric mass.
    • The mass was diagnosed as a grade 2 neuroendocrine tumor (NET).
    • Prior imaging from 11 years earlier showed a smaller 13-mm mass in the same location, indicating slow growth.
    • Laparoscopic resection was successful, with no recurrence at 6 months.

    Conclusions:

    • Primary mesenteric neuroendocrine tumors are rare but should be considered in the differential diagnosis of mesenteric masses.
    • Slow tumor growth over a decade is possible for mesenteric NETs.
    • Multimodality imaging and tissue sampling are crucial for diagnosis and management.