Fig. 2

Left column images show baseline scanning, and right column shows images from the evaluation. a A metastasis is seen on the CT as a hypodense focus in the right liver lobe. c The corresponding PET/CT reveals slight pathological FLT uptake in the liver metastasis and relatively high physiological FLT uptake in the normal liver parenchyma. b The metastasis is more hypodense at the time of evaluation and the corresponding PET/CT. d Decreased FLT uptake as a non-active focus in the right liver lobe. e The primary tumour in rectum (baseline) is visualised on CT with the corresponding PET/CT. g High FLT uptake in the tumour. Physiological high FLT uptake is seen in the bone marrow and in the normal intestine. There is no uptake in the uterus in the left side of the pelvis. f At the evaluation, structural shrinkage of the primary tumour on CT is shown and the corresponding PET/CT. h Normalised FLT uptake in the residual tumour. There is physiological FLT uptake in the bone marrow and in the small intestine in the left side of the pelvis