Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Indistinct airspace opacity in the medial right lung base but does not silhouette the right heart border corresponds to the confluent right infrahilar mass seen on recent chest CT . Fluid - filled fluid to should follow - up a linear due to , or pneumothorax . The cardiomediastinal silhouette is otherwise within normal limits .
    OUTPUT:
    
Right infrahilar airspace opacity is redemonstrated , better characterized by recent chest CT .