Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a persistent opacity obscuring the right heart border which may represent a post obstructive process , better characterized on recent chest CT . Lobe peripherally at the right lung base , there is a semilunar opacity without CT correlate and may not be in intrathoracic process . The cardiac silhouette is mildly enlarged . There is no pneumothorax . There is thickening of the minor fissure with likely some pleural fluid .
    OUTPUT:
    
Focal opacity at the right middle lobe obscuring the right heart border which could represent a post obstructive process , better characterized on recent chest CT .