Curriculum for Specialty Certificate Examination in Gastroenterology

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Thursday, 22 November 2012

GIST


3 comments:

  1. A 56-year-old man undergoes an EGD for longstanding reflux. A subepithelial lesion is seen in the gastric body. Endoscopic ultrasound is performed and a well-defined, hypoechoic mass is seen. The transition zone is identified with the muscularis propria of the stomach. The mass measures 3.2cm and has irregular outer borders. There is an anechoic area within the lesion measuring 8mm suspicious for a cystic component. Core biopsy is obtained and it reveals spindle cells, c-kit positive. What is the appropriate management strategy for this patient?

    A. Surveillance with endoscopic ultrasound

    B. Surgical excision

    C. Endoscopic mucosal resection

    D. Fiducial placement under endoscopic ultrasound guidance for radiation therapy

    Correct answer B
    Explanation

    This lesion is consistent with a gastrointestinal stromal tumor with high risk features on endoscopic ultrasound (size greater than 2 cm, irregular border and cystic degeneration), therefore surgical excision is the best treatment option in this young patient. For smaller lesions, typically less than 2cm, surveillance is a reasonable option because of the low likelihood of malignant potential. Endoscopic mucosal resection should not be undertaken in this case given that it arises from the muscularis propria (4th layer) and risk of perforation is high. Radiation therapy for this lesion is not appropriate.

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