Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post previous mitral valve replacement . Heart is mildly enlarged with left ventricular configuration . The aorta is tortuous . Within the lungs , patchy and linear opacities in the right middle and both lower lobes are noted , most prominent in the right middle lobe . Lungs are otherwise clear . Bones are diffusely demineralized and note is made of bilateral shoulder prostheses .
    OUTPUT:
    
1 . Cardiomegaly without evidence of congestive heart failure . 2 . Right middle and bibasilar opacities probably represent a combination of atelectasis and scarring . However , followup chest x-ray in ___ weeks is suggested to reassess the dominant right middle lobe opacity in order to exclude an active process in this region .