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Extramedullary relapse (EMR) after allogeneic hematopoietic stem cell transplantation (allo-HSCT) is relatively rare. The most commonly reported sites in acute lymphoblastic leukemia (ALL) patients after allo-HSCT are soft tissue and the central nervous system, and the gastrointestinal system is an uncommon site. We herein report a unique case with massive hematemesis resulting from gastrointestinal relapse of ALL after allo-HSCT. Upper gastrointestinal endoscopy showed bleeding from a 1.5-cm submucosal tumorous lesion with central ulceration on the anterior wall of the stomach. At the same time, computed tomography revealed extramedullary relapse at the breast and bilateral adrenal glands.

Extramedullary Gastric Relapse at the Time of Bone Marrow Relapse of Acute Lymphoblastic Leukemia after Allogeneic Bone Marrow Transplantation