A duodenal gastrointestinal stromal tumor mimicking a pancreatic neuroendocrine tumor: a case report. - Inoue, Masashi; Ohmori, Ichiro; Watanabe, Atsuhiro; Kajikawa, Ryujiro; Kajiwara, Ryotaro; Sawada, Hiroyuki; Miyamoto, Kazuaki; Ikeda, Masahiro; Toyota, Kazuhiro; Sadamoto, Seiji; Takahashi, Tadateru (Journal of Medical Case Reports, 2022)