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Gastrointestinal Stromal Tumor

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One third of gastrointestinal stromal tumors (GISTs) occur in the small intestine, making it the second most common site for them. As with other sites, it is a firm, rounded mesenchymal tumor that typically arises from the wall of the intestine. Most GISTs have a mutation in either CKIT or PDGFRA. Image Copyright: pathorama.ch.

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