Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest has been obtained with patient in semi-upright position . Analysis is performed in direct comparison with the next preceding similar study of ___ . Cardiac enlargement as before , but no increased pulmonary vascular congestion in comparison with the preceding study . The left basal parenchymal density has increased and obliterates the diaphragmatic contour completely . Possibility of coexisting localized pleural effusion in this area can not be excluded . Comparison of the pulmonary vasculature demonstrates possibly further mild regression of the congestive pattern . On the previous examination , there existed some hazy diffuse density in the left base already , but this appears to have progressed .
    OUTPUT:
    
Regression of pulmonary congestion , increased local left basal density suggestive of an inflammatory infiltrate . Referring physician , ___ , was paged at 4 :05 p .m .