Fig. 1

Representative cases of RP patients with airway involvement on PET of different patterns. A FDG-avid lesion was only seen in the larynx (focal pattern). B and C represented multifocal pattern that affected 2-3 segments of the airway. B Radiotracer uptake was identified mainly in the lobar and segmental bronchi: C Increased FDG uptake was seen in the bilateral main bronchi and extended to the left lower lobar bronchi. Focal uptake was also noted in the larynx and segmental bronchi. D Diffuse FDG uptake in the airway involving from the larynx extended to the lobar bronchi (diffuse pattern). Other involved sites (hollow arrows) included auricles (A, B) and costicartilages (D)