Positron emission tomography and magnetic resonance imaging combined with computed tomography in tumor volume delineation: A case report

Figure 1 Scan of the patient's skull base and the site of tumor invasion (red circle). The magnetic resonance imaging-computed tomography (CT) fusion image has a high resolution of soft tissue, including the tumor boundary and lymph nodes. However, compared with the positron emission tomography (PET)-CT fusion image, the bone invasion site is not shown (blue arrow). The PET-CT fusion image shows the tumor and its invasion by hypermetabolism with a high sensitivity for tumor recognition. However, the decreased glucose uptake of tumor necrotic tissues did not develop (red arrow), causing false-negative results.