title: Letter: Use of ultrasound in opaque hemithorax.
mesh_terms: D003937:Diagnosis, Differential; D003964:Diaphragm; D006801:Humans; D008099:Liver; D008175:Lung Neoplasms / Q000175:diagnosis*; D010996:Pleural Effusion / Q000175:diagnosis*; D014463:Ultrasonography