- Etiology: non-infected fluid in pleural space, common causes are infection (Streptococcus pneumonia, Staphylococcus aureus, group A Streptococcus, Mycoplasma, Tuberculosis), cardiac failure
- CXR: elevation of the hemidiaphragm with lateralization of the apex of the hemidiaphragm on the AP view, decubitus view will show free flowing pleural effusion
- US: clear pleural fluid between the inferior border of the lung and the diaphragm
- DDX: diaphragm eventration, diaphragm paralysis
Radiology Cases of Subpulmonic Pleural Effusion
