Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Linear left lateral opacity is likely due to atelectasis versus scarring . The lungs are otherwise clear without focal consolidation , effusion , or overt pulmonary edema . Moderate cardiomegaly is similar compared to prior . Catheter projecting over the right side of the neck and central chest within the anterior subcutaneous tissues , likely a ventriculoperitoneal shunt .
    OUTPUT:
    
Moderate cardiomegaly without superimposed cardiopulmonary process .