Hemoglobin was 16.2 g/dL with hematocrit of 48.7%, mild leukocytosis of 12.5 × 103/μL with neutrophilia of 76%, and normal platelet count of 307 × 103/μL. Serum BUN, creatinine, electrolytes, coagulation, and albumin results were normal. Liver function test results were normal, except an elevated γ-glutamyltranspeptidase of 117 U/L. Arterial blood gases on oxygen (10 L/min by face mask) revealed pH 7.45; Paco2, 39 mm Hg; Pao2, 83 mm Hg; HCO3, 27.6, base excess, + 4.0; and oxygen saturation of 96.7%. A chest radiograph showed homogenous opacification of right hemithorax with right-sided mediastinal shift suggestive of right lung collapse (Fig 1
). A CT scan of the chest revealed a mass lesion completely occluding the right main bronchus protruding above the carina, causing complete collapse of the right lung (Fig 2
). There was no mediastinal lymphadenopathy. The left lung, liver, and adrenals were normal.