This document discusses a patient presenting with shortness of breath, cough, and fever. On examination, the patient has diminished breath sounds and rales. A chest x-ray shows an infiltrate in the right middle lobe. Potential diagnoses discussed include pneumonia, myocardial infarction, pulmonary embolism, congestive heart failure, and asthma. Pneumonia is considered the most likely based on symptoms and exam findings. References from 2013-2018 are provided to support the different diagnoses.