Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right humeral head joint prosthesis appears dislocated from the glenoid fossa . The prosthesis obscures a portion of the right upper lung . Low lung volumes cause bronchovascular crowding and bibasilar atelectasis . Allowing for this , there is moderate central pulmonary vascular congestion with likely mild interstitial pulmonary edema . Bibasilar airspace opacities an indistinct opacification of the right upper lung may represent atelectasis , edema , or focal consolidation . A rounded lucent lesion with surrounding density projecting at the level of the right fourth rib is likely a benign lesion within the posterior rib with peripheral sclerosis . There is moderate cardiomegaly . There is no pneumothorax . Diffuse demineralization . There is a small to moderate hiatal hernia
    OUTPUT:
    
1 . Evaluation is limited by low lung volumes and a dislocated right humeral head prosthesis projecting over the right upper lung . 2 . Moderate cardiomegaly with moderate central pulmonary vascular congestion and mild associated interstitial edema . 3 . Indistinct airspace opacities at the lung bases and right upper lung may be due to edema , atelectasis , or consolidation , depending upon the clinical scenario . 4 . Indeterminate lucent lesion projecting at the level of the posterior right fourth rib may represent a benign osseous lesion , in the absence of prior studies a pulmonary parenchymal process can not be excluded .