Proton beam therapy of periorbital sinonasal squamous cell carcinoma: Two case reports and review of literature

Figure 6 Complete tumor remission demonstrated in the positron emission tomography with 2-deoxy-2--fluorine-18-fluoro-D-glucose/computed tomography and magnetic resonance imaging at 8 mo after proton beam therapy. A: No pathologically increased activity in the positron emission tomography, overview image; B: Absence of increased fluoro-D-glucose avidity in the nasal bridge (arrow-marked in positron emission tomography/computed tomography); C: Absence of metabolically active tumor in the nostrils; D: Corresponding area in the nasal bridge in magnetic resonance imaging, presented in axial plane; E: Corresponding area in the frontal skull base, presented in sagittal plane; F: Coronal presentation of tumor remission in the nasal bridge. Previously enhancing tumors marked with arrows.