A 74-year-old man with right upper eyelid swell accepted FDG PET/CT examination, which showed an intensely FDG-avid soft tissue nodular mass within the eyelid. It was suggestive of malignancy. There was no evidence of active neoplastic disease elsewhere. The nodule was excised by surgery. Histopathological findings showed characteristic findings of diffuse large B-cell lymphoma. This case highlights the utility of FDG PET/CT in identifying rare types of lymphoma.