[Gastrointestinal stromal duodenal tumors: diagnostic mistakes and modern approaches to treatment]. / Gastrointestinal'nye stromal'nye opukholi dvenadtsatiperstnoi kishki: oshibki diagnostiki i sovremennye podkhody k lecheniyu.

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 tumor¼, «pancreatic cyst¼ and «retroperitoneal abscess¼, who were treated at the Blokhin National Cancer Research Centre in 2019-2020.