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Gastrointestinal stromal tumours: a regular origin in the muscularis propria, but an extremely diverse gross presentation

A review of 200 cases to critically re-evaluate the concept of so-called extra-gastrointestinal stromal tumours

  • Current Concepts in Clinical Surgery
  • Published:
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Abstract

Background

Gastrointestinal stromal tumours (GISTs) are thought to arise from the interstitial cells of Cajal (ICCs). ICCs form a network surrounding the myenteric plexus and between-muscle fibres of the muscularis propria of the tubular GI tract. The cell of origin of so-called extra-gastrointestinal stromal tumours (EGISTs) is not known.

Aim and methods

To study the diversity of gross presentation of GISTs and to critically assess the incidence of EGISTs and their relationship to mural GISTs, a total of 200 neoplasms with typical morphologic and immunohistochemical features of GISTs were reviewed, looking for any degree of association with the muscularis propria of the gut wall.

Results

There were 130 gastric (65%), 9 duodenal (4.5%), 48 small intestinal (24%), 9 colorectal (4.5%), 1 appendiceal (0.5%) and 3 unclassifiable GISTs (1.5%). Fourteen cases (7%) were initially submitted as EGISTs (four mesenteric, four omental, one pararectal/prostatic, one pelvic/Douglas, one perivesical, one located between root of mesentery and tail of pancreas, one involving the mesentery, omentum and abdominal wall extensively and one located between liver and stomach). After critical re-evaluation of surgical reports and remote clinical history and a careful search for residual muscular tissue from the gut wall in the tumour pseudocapsule (in some cases supported by desmin immunoreactivity), it was possible to reclassify most of these cases (11/14) as either GISTs with extensive extramural growth resulting in loss of contact to the external muscle coat of the gut (8/14) or as metastases from an inoperable GIST (2/14) or from a previously resected deceptively benign tumour (1/14).

Conclusion

EGISTs are probably rarer than previously reported (1.5% or less in this study). We concluded that most so-called EGISTs represent apparent EGISTs that should have arisen from the outermost muscle coat, but have lost their contact to the point of origin due to extensive extramural growth pattern. From a surgical point of view, it is crucial to document and mark any focal attachment or adhesions to the gut wall noticed during surgery for an apparent EGIST. In contrast to most other neoplasms, GISTs should be defined by virtue of any degree of association with the muscularis propria (no matter how minimal), but not by localisation of the bulk of the tumour.

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Authors and Affiliations

  1. Institut für Pathologie, Klinikum Nürnberg, Prof. Ernst-Nathan-Strasse 1, 90419, Nürnberg, Germany

    Abbas Agaimy & Peter H. Wünsch

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  1. Abbas Agaimy
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Correspondence to Abbas Agaimy.

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Agaimy, A., Wünsch, P.H. Gastrointestinal stromal tumours: a regular origin in the muscularis propria, but an extremely diverse gross presentation. Langenbecks Arch Surg 391, 322–329 (2006). https://doi.org/10.1007/s00423-005-0005-5

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  • DOI: https://doi.org/10.1007/s00423-005-0005-5

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