Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no focal airspace opacity to suggest acute chest syndrome . There is no pulmonary edema , pleural effusion , or pneumothorax . The mediastinal contours are normal . Mild prominence of the pulmonary vasculature is unchanged . There is unchanged moderate cardiomegaly .
    OUTPUT:
    
1 . No focal airspace opacity to suggest acute chest syndrome or pneumonia . 2 . Unchanged moderate cardiomegaly , in keeping with the history of sickle cell .