Acute Brain Stroke Evolution Detected by 18F-FDG PET/CT and MRI Justifies the Discordance of Lesions in a Patient With Lymphoproliferative Syndrome.

A 50-year-old man with angioimmunoblastic T-cell lymphoma in complete response to treatment presented new hypermetabolic brain lesions on 18F-FDG PET/CT suggestive of malignancy. These findings were correlated by MRI that showed cortical-subcortical peripheral lesions typical of acute ischemic infarction. A restaging 18F-FDG PET/CT showed that hypermetabolic lesions were replaced by ametabolic areas, supporting chronic infarction.