Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size , mediastinal , and hilar contours are normal . A new nodular opacity in the left lung lingula is identified , concerning for pneumonia . This is best seen on the PA view , and likely projects over the heart on the lateral view . No effusion or pneumothorax .
    OUTPUT:
    
New nodular opacity in the left lung lingula , concerning for pneumonia . Given its morphology , followup imaging in 4 weeks to resolution is strongly recommended .