Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are lower causing bronchovascular crowding . Cardiomediastinal silhouette is otherwise normal . On lateral view , increased opacity posterior lower lungs may be due to the patient 's body habitus . No correlate is present on the frontal view . No effusion or pneumothorax .
    OUTPUT:
    
Increased opacity of the posterior lower lungs on lateral view usually indicates underlying pathology such as infection , as the classic radiological " spine sign . " However , in this case , it may be due to underpenetration of the x-ray due to the patient 's body habitus . Oblique radiographic views may be helpful for further evaluation .