Westermark’s Sign and Palla’s Sign in Pulmonary Embolism

A 90-year-old man with atrial fibrillation presented with sudden-onset dyspnea. Chest radiography revealed a paucity of pulmonary vasculature in the right lung fields and an enlarged right descending pulmonary artery.

​   The New England Journal of Medicine: Search Results in Pulmonary/Critical Care