An 80-year-old white man was admitted to the hospital with progressively worsening shortness of breath. Symptoms began approximately 4 weeks prior to admission. The patient initially noticed dyspnea on exertion, but later advanced to shortness of breath at rest. The patient also suffered from right-sided chest pain and complained of increasing fatigue. His medical history was notable for hypertension, benign prostatic hypertrophy, and hyperlipidemia. His medications included 325 mg of aspirin daily. He denied any history of asbestos exposure and had no history of smoking.