Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . The patient is slightly rotated . Slightly increased left lower lobe opacity since ___ in the setting of unchanged left pleural effusion may represent an early or developing pneumonia rather than atelectasis . There is no pneumothorax . Heart size is normal . Increased density adjacent to the right paratracheal stripe is likely due to lymphadenopathy seen on chest CT ___ . The aorta is mildly tortuous with aortic knob calcifications , unchanged .
    OUTPUT:
    
Slightly increased left lower lobe opacity since ___ in the setting of unchanged left pleural effusion may represent an early or developing pneumonia , less likely atelectasis .