False-Positive 18F-Prostate-Specific Membrane Antigen-1007 PET/CT Caused by Hepatic Multifocal Inflammatory Foci.

A 68-year-old man with history of treated prostate cancer was referred to Ga-prostate-specific membrane antigen (PSMA)-11 PET/CT imaging. Moderate bone involvement was observed, with a normal liver tracer uptake. Bone biopsy confirmed metastases of prostate cancer. After therapy adjustment, a follow-up F-PSMA-1007 PET/CT revealed good response in bone lesions, although it showed 3 new rounded liver intense uptake foci. Concurrent PSA was 0.6 ng/mL. Liver function tests were normal. PET/CT-guided hepatic biopsy demonstrated no malignant cells, focal inflammation, and steatosis, being possibly the inflammation the cause of false-positive multifocal uptake of F-PSMA-1007. Following PET/CT, controls showed a normal liver.