Figure 18c. LCNEC in a 63-year-old man. (a) Axial CT scan (5.0-mm section thickness) obtained at the level of the distal right main bronchus shows a 37-mm-diameter mass (arrow) in the right upper lobar bronchus. (b) CT scan (lung window) shows the proximal end of the endobronchial mass (arrow) and peripheral mucus plugging (arrowhead). (c) Photograph of the gross specimen shows the yellow endobronchial mass (arrow) and distal mucus plugging (arrowheads).