Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There may be mild elevation of pulmonary venous pressure , which appears slightly improved compared to ___ , possibly due to better inspiration . Stable increased opacity of the right base represents pleural effusion and volume loss . Cardiomediastinal silhouette is grossly stable . A retrocardiac density represents a hiatal hernia .
    OUTPUT:
    
Mild elevation of pulmonary venous pressure , appearing slightly improved compared to prior .