Figure 1.

Case 1, endobronchial carcinoid. A: Antero-posterior chest X-ray diagnosed at the onset of the last episode of pneumonia, demonstrating a complete collapse of the left lung with hyperdistension of controlateral one. There is also an aerial bronchogram with a block before the carena; B: Axial computed tomography-scan (CT-scan), performed before operation, demonstrating atelectasis of left lung with pleural effusion; in particular we can observe the obstruction of the left main bronchus; C: Gross findings of the resected left lung, on lateral surface a 1.5 cm polypoid mass obstructing the left main bronchus, firmly adherent to the wall and with a differing consistency from hard to elastic; D: The tumor was pathologically diagnosed as endobronchial carcinoid: on the left the cartilaginous wall and on the right the tumor (HE stain x 20). Monomorphic proliferation with cells forming pseudoacinouses patterns. Absence of atypical cells or abundant mitosis.