Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to ___ , there is dense lobulated opacification projecting over the left lower lungs , possibly representing collapse associated with a loculated pleural effusion ; however , infiltrative malignancy is not excluded adjacent to dense upper mediastinal opacification likely correlating with large anterior soft tissue mass . A small loculated effusion within the pleural fissure is a less likely possibility . Right lung is clear . Stable severe cardiomegaly identified .
    OUTPUT:
    
Lobulated opacification projecting over left lower lung , atelectasis and loculated pleural vs infiltrative mass . Opacification projecting over the upper mediastinum and left upper lung likely relates to large anterior soft tissue tumor better evident on ___ CT .