Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: On the aforementioned comparison , the patient was noted to have an opacity at the left lung base for which dedicated chest x-ray was recommend . Again seen on lateral , is a heterogenous opacity overlying anterior lower thoracic spine . There was a left mild pleural effusion seen on ___ radiograph but has since resolved . The descending aorta is ectatic . The heart size is normal .
    OUTPUT:
    
Heterogenous opacity at the lower lung base which could reflect aspiration or pneumonia , routine oblique views of the chest are recommended to further characterize this abnormality .