Figure 15a. Endobronchial carcinoid tumor in a 54-year-old woman. (a) Transaxial contrast material-enhanced CT scan (2.5-mm collimation) obtained at the level of the lingular segmental bronchus shows a round, 21-mm endobronchial nodule in the bronchus intermedius (arrow) with attendant distal obstructive atelectasis in the right lower lobe. The nodule demonstrates strong enhancement (40 HU). Note also the calcific attenuation within the lesion (arrowhead). (b) FDG PET scan demonstrates little glucose uptake at the nodule site (arrow).