Definition: In this task, you are given a patient case. Tell me which diagnosis is the most likely based on the patient case. Then, give an explanation.

Example:
Patient Case: A 70 year old male patient with a history of chronic obstructive pulmonary disease, coronary artery disease, and obstructive sleep apnea came to the emergency department with shortness of breath. He awoke with a sensation of substernal chest heaviness and dyspnea. He took a nitroglycerin tab, which did not help. He used a nebulizer, but that did not help. When he called emergency medical services, they noted that the patient was in significant respiratory distress with tachycardia and tachypnea. The patient pointed to the substernal chest area and indicated pain. Physical exam showed decreased tactile fremitus on the right, as well as hyperresonance upon percussion.
Most Likely Diagnosis: Pneumothorax
Explanation: Pneumothorax can result in dyspnea, tachycardia, and tachypnea. A sharp, stabbing chest pain is often indicated during a pneumothorax. There would be decreased tactile fremitus during a pneumothorax because of decreased transmission of sound waves. There would be hyperresonance because of extra air trapped in the lungs in a pneumothorax.

Patient Case: A 56 year old patient comes to the clinic for a follow-up visit. 3 months prior, the patient was admitted to the hospital with fever, productive cough, and shortness of breath. He was diagnosed with pneumonia and was treated with antibiotics. After finishing the antibiotics, the patient started to develop low grade fevers at home alongside night sweats and a cough. He returned to the clinic 3 months later with persistent right sided chest pain that was worse with inspiration, weight loss, and anorexia. Upon physical exam, he had decreased breath sounds and dullness to percussion in the right base of the lung. Tactile fremitus was also decreased.
Most Likely Diagnosis: 
Explanation: