Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is diffuse heterogeneous opacity within the bilateral lower lobes , which has improved from the prior study . Heart size is top normal and unchanged . There is bilateral fullness within the hila , as well as convexity of the azygoesophageal recess likely reflecting the patient 's known lymphadenopathy . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
Bibasilar heterogeneous opacities , left worse than right , are concerning for pneumonia given the patient 's clinical history . There is interval improvement from the prior chest radiograph .