Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided demonstrate left lung base opacity , which is mostly of a linear configuration which suggests atelectasis , though the possibility of an early pneumonia is impossible to exclude . Right mid lung plate - like atelectasis is also noted . No large effusion or pneumothorax . Cardiomediastinal silhouette appears stable and within normal limits . Bony structures are intact .
    OUTPUT:
    
Linear opacities in the lower lungs , left greater than right .