As conventional imaging (Ultrasonography, CT) and 99mTc-WBC scan were inconclusive, the heart-surgeons proposed to perform an 18F-FDG PET/CT to evaluate the extention of active infection process, on the basis of studies showing that cells involved in infection and inflammation, especially neutrophils and the monocyte/macrophage family, are able to express high levels of glucose transporters, especially GLUT1 and GLUT3, and hexokinase activity (in according to european guidelines). Here, SLC2A1 is linked to infection.