Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . Lung volumes are somewhat low . No convincing signs of pneumonia or CHF . A vague rounded opacity projects over the left lung base for which CT is recommended on a non-emergent basis to further assess . This opacity is only seen on the frontal projection and may represent superimposed shadows , though difficult to exclude a true pulmonary nodule . No pneumothorax or effusion . Cardiomediastinal silhouette appears normal . Bony structures are intact .
    OUTPUT:
    
Nodular opacity in the left lower lung for which non-emergent CT is recommended to further assess .