case_images: PMC8432924_01
case_images: (A and B) Chest radiograph PA and lateral showing left lung
  collapse (left hemithorax homogenous opacity with volume loss).
  . (C) Mediastinal window shows a well-defined intraluminal growth in
  the the left main bronchus occluding the airway (arrow).. (D) Fibre optic
  bronchoscopy, reddish-yellow polypoidal mass occluding whole lumen
  of the left main bronchus.. (E and F) Post pneumonectomy view. Huge
  bulky tumour removed from left main bronchus.. (G) Round nuclei and
  ample amounts of granular cytoplasm seen at high power.. (H) Stain positive for chromogranin and synaptophysin.
case_images: AJTCCM-24-2-209-fig1.jpg
case_images: PMC8432924_01_AJTCCM-24-2-209-fig1.jpg
case_images: F1
case_images: A chest X-ray showed complete collapse of the left lung with cut-off in the proximal left main bronchus (Figs 1A and 1B). A flexible bronchoscopy was done which showed a smooth, reddish-yellow polypoidal mass occluding the entire lumen of the left main bronchus (Fig. 1C). Computed tomography (CT) of the chest showed the endobronchial mass to be part of a large inhomogeneous lesion occupying the entire left upper lobe (Fig. 1D), and the patient was  referred for pneumonectomy. The surgical specimen is shown in Figs 1E and 1F. Histological evaluation showed the presence of uniform polygonal cells with finely granular chromatin in round nuclei and a moderate amount of eosinophilic cytoplasm without any nuclear atypia, mitosis or necrosis (Fig. 1G). A and synaptophysin (Fig. 1H). A diagnosis of typical carcinoid tumour was confirmed.