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AbstractGastrointestinal stromal tumors (GISTs) are the stromal or mesenchymal neoplasms affecting the gastrointestinal tract. Although they constitute 1% of primary gastrointestinal tumors, they are the most common nonepithelial tumors involving the gastrointestinal tract. They mostly present as overt or occult gastrointestinal bleeding. We present a case in which a 77-year-old female presented with a large abdominal mass. The origin of the mass was unclear on CT and MRI scan of the abdomen. Upper gastrointestinal endoscopic ultrasonography showed a cystic lesion in the perigastric region. A fine-needle biopsy of the lesion was performed, which was consistent with spindle type GIST. After the initial failure of imatinib therapy, the tumor was managed surgically.

Imatinib-Resistant Gastrointestinal Stromal Tumor Presenting as a Large Abdominal Mass