Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest views were obtained with patient in upright position . Comparison is made with the next preceding two chest examinations of ___ and ___ . The heart size remains unchanged and is within normal limits . Thoracic aorta mildly widened and elongated but without local contour abnormalities . The pulmonary vasculature is not congested . The on next previous examination identified temporarily increased pleural effusion that blunted the left lateral pleural sinus and extended into the posterior pleural spaces has now decreased markedly and only a very mild peripheral blunting of the lateral pleural sinus remains . Also the appearance of the crowded pulmonary vasculature on the previously existing left lower lobe atelectasis has normalized with the exception of a few peripheral linear scar formations , the findings are now unremarkable . When comparison is extended to the chest examinations of ___ , there was indeed a temporary increase of the pleural effusion on examination of ___ . There is no evidence of new changes in the previously described rib fractures and on the frontal view can identify several non-displaced rib fractures . No radiographic detectable callus formation present .
    OUTPUT:
    
Normalization of pleural effusion and left lower lobe atelectasis related to previous trauma .