Case report: a rare case of gastroduodenal intussusception caused by GIST in an elderly patient and literature review.

Gastroduodenal intussusception is a rare phenomenon in adults and is caused by gastrointestinal stromal tumors (GIST) in the majority of the documented cases. It commonly presents with abdominal pain, vomiting and melena. GIST is the most common gastrointestinal mesenchymal tumor in gastric and non-gastric locations. It is characterized classically by KIT or PGDFRA expression, and immunohistochemical analysis is the mainstay of diagnosis. Surgical resection provides definitive treatment in 70% of the cases. Here, we present a rare case of gastroduodenal intussusception caused by GIST in an elderly patient.