Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Asymmetric increased density and interstitial vascular prominence at the right lung base compared to the left lung base . Otherwise , the lungs are clear . No pleural effusion . No pneumothorax . The descending aorta is tortuous , but stable compared to the prior exam . The cardiomediastinal silhouette and hila are unchanged . No acute osseous abnormality .
    OUTPUT:
    
Asymmetric interstitial markings and increased density in the right lower lung , which may represent an early pneumonia given the patient 's clinical symptoms . Vascular congestion is also possible but less likely in the absence of cardiomegaly .