Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The left - sided Port - A - Cath is unchanged in appearance . Bilateral left greater than right hazy opacities are substantially improved although not completely resolved . Left basilar linear retrocardiac atelectasis is slightly more prominent . The hemidiaphragms , cardiac borders , and mediastinal silhouettes are stable .
    OUTPUT:
    
Substantially improved bilateral hazy opacities with slight residual opacification . Follow - up chest radiograph in 4 weeks is recommended to ensure resolution .