Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The quality of the image is limited due to patient 's body habitus . Allowing for these limitations , lung volumes are low , without focal opacities . Assessment of the left lung base is limited due to obscuration by severe cardiomegaly which is not significantly changed compared with prior exam . Mediastinal widening is secondary to mediastinal fat better assessed in prior CT . There is no evidence of pleural effusion or pneumothorax . A linear lucency crossing across the soft tissues in the left as well as the left lower lung field represents air trapped in a skinfold underneath the breast tissue . Sternotomy wires are intact .
    OUTPUT:
    
Severe cardiomegaly , unchanged from prior . Otherwise , no evidence of acute cardiopulmonary process .