Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Midline sternotomy wires and mediastinal clips as well as a prosthetic cardiac valve again seen . The heart remains mildly enlarged . No focal consolidation , large effusion or pneumothorax . No signs of congestion or edema . Subtle asymmetric opacity abutting the right diaphragm has been stable compared to multiple prior exams dated back to at least ___ , and correlates with a prominent costochondral calcification on the prior CT . Mediastinal contour is stable . Chronic right mid shaft clavicle and ribcage deformities are chronic .
    OUTPUT:
    
No acute intrathoracic process .