A 65-year-old woman has been on a ventilator for the past two weeks since sustaining head trauma in a motor vehicle collision. Serial chest x-rays taken during admission are consistent with acute respiratory distress syndrome. Bronchoalveolar lavage shows gram-positive cocci and gram-negative rods. A current chest x-ray shows a cavitary lesion in the right lower lobe. Which of the following is the most likely diagnosis?
Acute bronchopulmonary aspergillosis
Atelectasis
Pneumatocele
Pulmonary abscess
Tuberculosis
