Figure 2 A 57-year-old woman with PCT and bronchiectasis and atelectasis. A patchy shadow was found in the left lower lobe on conventional CT image (long white arrows; A, lung window; B, mediastinal window) and contrast-enhanced CT images (white arrowheads; C, D). Obviously dilated and beaded bronchi were observed in the lung section (E). PCT was shown by histopathological examination (F, black arrow). Tumorlets consisted of a comparatively uniform population of cells with oval or spindle nuclei, without mitoses.