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Liver metastasis of a gastrointestinal stromal tumor (GIST) in a 68-year-old man. T1-weighted contrast-enhanced MRI (DCE) images and FDG-PET SUV parametric maps (SUV) acquired pretherapy (a) and following the administration of imatinib (b) and pretherapy (a), imaging findings evidenced a metabolic active tumor with areas of heterogenic enhancement (white arrows). Post-therapy (b), the tumor presented almost a total absence of enhancement and a complete metabolic response on PET imaging
