Abstract
Gastrointestinal stromal duodenal tumors are rare diseases of small intestine. Duodenal GISTs may be giant; these neoplasms can also simulate malignancies of other organs. These features result diagnostic and treatment mistakes. Neoadjuvant therapy with imatinib results tumor shrinkage and ensures organ-sparing surgery. We report duodenal GISTs in patients with primary diagnosis «retroperitoneal tumor», «pancreatic cyst» and «retroperitoneal abscess», who were treated at the Blokhin National Cancer Research Centre in 2019-2020.
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