Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal silhouette is grossly unchanged . The right lung is clear . Pleural effusion is small , if any . Left midlung opacity has decreased from prior . In addition , there is mild increased mediastinal shift to the left .
    OUTPUT:
    
Decreased left mid lung opacity with mild interval increased mediastinal shift to the left , findings most reflective of developing post radiation fibrosis .