Abstract
Background Gastrointestinal stromal tumors (GISTs) are c-kit-positive tumors that may arise anywhere in the tubular gastrointestinal tract. Around 5% of the cases arise elsewhere in the abdominal cavity. Tumors originating in the omentum and mesentery have been reported. Case A 31-year-old woman presented with pelvic pain, a palpable pelvic mass, and elevated CA-125. Imaging showed innumerable pelvic and abdominal masses. Histopathology showed a GIST that was positive for c-kit and vimentin and negative for desmin and smooth muscle actin. The patient was started on imatinib mesylate. Six months after diagnosis the tumor has remained stable. Conclusions GI stromal tumors (GIST) may initially present as pelvic mass with elevated CA-125. Imatinib mesylate is the current mainstay therapy for GISTs after surgery.
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