157838.fig.001a
(a)
157838.fig.001b
(b)
Figure 1: CT findings of the central and peripheral squamous cell carcinomas. (a) Central squamous cell carcinoma was defined as a lesion located from trachea to the segmental bronchi. Note bronchiolar obstruction (arrowhead) and peripheral obstructive pneumonia (arrow). (b) Peripheral squamous cell carcinoma was defined as the one located in the more peripheral location.