A 65-year-old male presents with low-grade fever, cough, and blood-tinged sputum for 3 months. Chest X-ray (CXR) reveals left upper lobe atelectasis and a small pleural effusion. Which diagnostic test should be prioritized for confirmation?
A 65-year-old male presents with low-grade fever, cough, and blood-tinged sputum for 3 months. Chest X-ray (CXR) reveals left upper lobe atelectasis and a small pleural effusion. Which diagnostic test should be prioritized for confirmation?