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Esophagogastroduodenoscopy (EGD), performed approximately five months earlier, had not revealed any specific findings. However, an EGD performed in our hospital showed the presence of a round, protruding lesion (approximately 40\u00d730 mm in size), with a normal overlying mucosal surface, 35\u201339 cm from the upper incisor. Chest computed tomography (CT) revealed a large esophageal mass. Enucleation was performed on the esophageal mass, and a GIST was diagnosed using immunochemical staining. Imatinib mesylate administration was initiated two months postoperatively. The patient was stable, without any evident recurrence in the 8-month postoperative follow-up EGD and chest CT examinations. Therefore, physicians should consider that patients with worsening dysphagia may have an underlying organic condition, such as an acute increase in size of an esophageal GIST, even if recent examinations were unremarkable.<\/jats:p>","DOI":"10.7704\/kjhugr.2024.0074","type":"journal-article","created":{"date-parts":[[2025,3,10]],"date-time":"2025-03-10T02:23:51Z","timestamp":1741573431000},"page":"64-69","update-policy":"https:\/\/doi.org\/10.7704\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Rapidly Growing Gastrointestinal Stromal Tumor on the Esophagus"],"prefix":"10.7704","volume":"25","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-1613-1016","authenticated-orcid":true,"given":"Ji Hye","family":"Park","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1835-4830","authenticated-orcid":true,"given":"Sung 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