Discordant Metabolic Response on 18F-FDG PET/CT in Synchronous Primary Gastric Lymphoma and Gastric Adenocarcinoma.

Hao, Wanting; Li, Yaming; Du, Bulin; Li, Xuena · Clin Nucl Med · 2022

case_report · Level V

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Abstract

An 84-year-old man presented with dysphagia for 20 days. The biopsies of the multiple lesions through gastroscopy revealed gastric diffuse large B-cell lymphoma and gastric adenocarcinoma. Staging 18F-FDG PET/CT showed multiple hypermetabolic lesions in the stomach, abdomen, and pelvis. After 4 courses of chemotherapy, except for the lesion of biopsy-proven gastric adenocarcinoma, other hypermetabolic lesions in stomach and other sites returned to normal on posttherapy 18F-FDG PET/CT. This case indicated that 18F-FDG PET/CT can track differential treatment response of synchronous gastric tumors and guide subsequent therapy.

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