Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Minimally increased interstitial markings in the retrocardiac area most likely represent atelectatic changes , however early infectious process is possible in the proper clinical setting . There is no pneumothorax , pulmonary vascular congestion , or pleural effusion . The descending aorta is tortuous . The cardiomediastinal silhouette is otherwise unremarkable . Chronic appearing right - sided rib deformities likely reflect remote fractures .
    OUTPUT:
    
Minimally increased interstitial markings in the left lung base likely represent atelectasis , however no early infectious process is possible in the proper clinical setting .