Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Chest PA and lateral radiograph demonstrates decreased size of the left upper lobe opacity possibly due to resolution of hemorrhage , now measuring 2 .8 in the craniocaudal dimension compared to 3 .5 cm on prior study . There is persisitent if not increased streaky retrocardiac opacities , possibly related to aspiration . No definitive opacification concerning for pneumonia . Minimal left costophrenic angle blunting , likely represents small left pleural effusion . No osseous abnormalities identified .
    OUTPUT:
    
Interval decrease in size of left upper lobe opacity , possibly reflecting resolution of prior hemorrhage . Likely small left pleural effusion .