Figure 1. (a) Chest radiograph shows an irregular opacity (arrows) in the left middle lung field. (b) Axial high resolution CT (HRCT) image obtained at the upper portion of the mass corresponding to the section indicated on the gross specimen as a black line shown in Figure 1e. The anterior part of the mass has an irregular margin and convergence of peripheral vessels, while the posterior part has a smooth margin and a cavity. (c) Contrast-enhanced dynamic study. CT scans obtained (a) before (b) 25 s (c) 45 s (d) 65 s and (e) 150 s after the administration of contrast agent at the same level of Figure 1b. The anterior part (X) of the mass has homogeneous enhancement while the posterior part (O) has peripheral enhancement. (d) Time–attenuation curves for the anterior (X) and dorsal parts (O) of the mass indicated in Figure 1c. The anterior part shows gradual enhancement with a peak enhancement at 65 s after the administration of contrast agent while the central area of the posterior part shows no significant enhancement. (e) Coronal cut surface of the surgical specimen demonstrates a yellowish-white tubular shaped mass in the subpleural area (arrowheads). There is a whitish mass with irregular margin (asterisk) adjacent to the subpleural mass. (f) Photomicrograph of the pathological specimen shows the coexistence of a moderately differentiated adenocarcinoma (arrows) and typical tuberculous granuloma (arrowheads) (haematoxylin and eosin stain, x 70).