Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is again mild - to - moderately enlarged . The mediastinal and hilar contours appear unchanged . The pulmonary interstitium is slightly prominent bilaterally , which suggests slight mild congestion or fluid overload . In addition , the lateral view depicts a posterior opacity projecting over the lower lobes , which is difficult to visualize on the frontal view , but is suspected to relate to the left lower lobe , noting new mild relative elevation of the left hemidiaphragm which may suggest volume loss . There is no pleural effusion or pneumothorax . Mild rightward convex curvature of the thoracic spine is noted .
    OUTPUT:
    
1 . Findings suggesting slight fluid overload or pulmonary congestion . 2 . Vague posterior opacity suspected to reside in the left lower lobe with indication of volume loss . Although the films are not optimal particularly noting substantial soft tissue attenuation , the possibility that this may represent pneumonia in the appropriate clinical setting should be entertained , but it is probably also compatible with atelectasis and volume loss .