the chest Xray of my 7 year old son reads There is no infiltrate in both the lungs fields.  Peribronchial cuffing is seen bilaterally. No hilar or mediastinal adenopathy is present. The right hemidiaphragm is elevated and costophrenic angle is blunted. Clinical correlation and an ultrasound is recommended further to evalute for any sub diaphragmatic collection.  the left costophrenic angle and the hemidiaphragm is unremarkable.  The cardiac silhouette is within normal limits.  The bones and soft tissues are within normal limits.  Clinical correlation is recommended
Need ultrasonography to clear doubt of presence of any fluid in rib case.  The cause of fluid will depend on history.