LAUSR

Abstract Introduction: Complications such as severe infection may occur during the chemotherapy of malignant lymphoma. Phlegmonous gastritis (PG) is a rare acute bacterial infection associated with high mortality, requiring early diagnosis, and prompt management. In addition, Guillain–Barré syndrome (GBS) occasionally requires early treatment and intensive care management due to the occurrence of severe neuropathy and respiratory failure. Patient concerns: A 70-year-old male was diagnosed with primary gastric diffuse large B-cell lymphoma (DLBCL) after the detection of several polypoid tumors with ulcers. The patient underwent chemotherapy for DLBCL and exhibited adverse effects (i.e., fever, vomiting, epigastric pain, and neutropenia). Computed tomography indicated widespread thickening in the gastric wall. Furthermore, approximately 2 weeks later, the patient presented with gradual symmetric lower extremity weakness and respiratory failure due to paralysis of the respiratory muscle. Diagnoses: DLBCL was diagnosed through a gastric tumor biopsy. On the basis of the computed tomography findings, a culture of gastric juice, nerve conduction studies, and clinical symptoms, this case of gastric lymphoma was complicated with PG and GBS. Interventions: The patient was treated with antimicrobial therapy and administration of granulocyte colony-stimulating factor for PG, and with intravenous immunoglobulin and intensive care management for GBS. Outcomes: Despite the aggressive progress of the condition, the patient improved without relapse of DLBCL. Conclusion: PG was regarded as a precedent infection of GBS. In this article, we present the first reported case of gastric lymphoma complicated with PG and GBS.