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(A, B) In the exploratory laparotomy, a perforation in the terminal ileum (B) was discovered at the site coincident with the location of lymphoma involvement reflected in positron emission tomography/computed tomography scan before chimeric antigen receptor T-cell strategy targeting CD19 (CART19) infusion (A). (C) Pathological findings by H&E staining showed no lymphoma cells and partial necrotic tissue. (D) Immunochemical staining revealed a negative result for CART19.
