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Extragastrointestinal stromal tumour of the transverse mesocolon mimicking giant ovarian cystic neoplasm
  1. Douglas Wood,
  2. Greer Janssen and
  3. Imad Aljanabi
  1. General Surgery, Wellington Regional Hospital, Wellington, New Zealand
  1. Correspondence to Dr Douglas Wood; douglaswood94{at}


Gastrointestinal stromal tumours (GISTs) are mesenchymal tumours which are most commonly found along the gastrointestinal tract. They are more rarely found in an extragastrointestinal location and typically present late due to only vague symptoms from mass effect. There are very few case reports of GIST arising within the transverse mesocolon. We report a case of a large cystic transverse mesocolic GIST which preoperative imaging concluded was likely of ovarian origin. This resulted in an abrupt change in the surgical management intraoperatively, but fortunately, an R0 resection was still achieved. This serves as an important lesson to keep the differential diagnosis broad when dealing with large cystic abdominal masses. The tumour was found to be KIT wild type, with a platelet-derived growth factor receptor alpha D842V mutation identified, conferring intrinsic resistance to imatinib.

  • Gastrointestinal surgery
  • Oncology
  • Surgical oncology

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  • Contributors Report conceptualisation and methodology, obtainment of resources, and writing and preparation of the original draft were done by DW and GJ. Review and editing were done by DW, GJ and IA. Supervision was provided by IA. All authors read and agreed to the published version of the manuscript.

  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

  • Case reports provide a valuable learning resource for the scientific community and can indicate areas of interest for future research. They should not be used in isolation to guide treatment choices or public health policy.

  • Competing interests None declared.

  • Provenance and peer review Not commissioned; externally peer reviewed.