Retroperitoneal extragastrointestinal stromal tumor: radiologic pathologic correlation
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Updated: Apr 25, 2026

Robotic Duodenal Sleeve Resection for Gastrointestinal Stromal Tumor with Rare Exon 8 KIT Mutation Following Neoadjuvant Imatinib
Published on: April 3, 2026
Pankaj Watal1, Swetang G Brahmbhatt1, Prashant J Thoriya1
1Department of Radiodiagnosis, MP Shah Government Medical College, Jamnagar, Gujarat, India.
Abstract:
Neoplasms with histology and immunohistochemistry similar to gastrointestinal stromal tumors may occur primarily outside the gastrointestinal tract, usually in the omentum and mesentery. These are referred to as extragastrointestinal stromal tumors (EGISTs). Retroperitoneum is a very rare site for such neoplasms. We report a patient with EGIST in the retroperitoneum, elaborating the cross-sectional imaging and histopathologic findings.
