Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate low lung volumes , which accentuate bronchovascular markings . Hilar and mediastinal silhouettes are unremarkable . Heart has increased in size since ___ . Pulmonary vascular congestion . No pleural effusion . Multiple surgical clips project over the mediastinum . Superior sternotomy wire is fractured .
    OUTPUT:
    
Mild cardiomegaly and vascular congestion , not significantly changed since ___ .