Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single AP radiograph of the chest was acquired . Lung volumes are slightly low . A 2 .6 cm rounded opacity projects over the left lower lung , not seen on the prior study from ___ , possibly related to overlying musculoskeletal structures , although an intrathoracic process such as a pulmonary nodule , round atelectasis , or developing infection is not entirely excluded . The lungs are otherwise clear . The heart size is normal . The mediastinal contours are normal . There are no pleural effusions . No pneumothorax is seen .
    OUTPUT:
    
Rounded opacity projecting over the left lung base , incompletely characterized on this single AP projection , possibly related to superimposition of normal thoracic structures , although a pulmonary nodule , round atelectasis , or developing infection is not excluded . Recommend further evaluation with a dedicated PA and lateral series . Findings and recommendations were entered into the emergency department dashboard by Dr . ___ at 1 :41 p .m . on the day of the study .