A 40-yr-old with a pleural effusion who reports chest discomfort
A 72-yr-old with cor pulmonale who has 4+ bilateral edema in his legs and feet
A 64-yr-old with lung cancer and tracheal deviation after subclavian catheter insertion
A 28-yr-old with a history of a lung transplant 1 month ago and a fever of 101°F (38.3°C)