The observation of pleural opacities by B mode ultrasonogram.
D004653:Empyema / Q000175:diagnosis; D006801:Humans; D006876:Hydrothorax / Q000175:diagnosis; D008875:Middle Aged; D010994:Pleura / Q000473:pathology*; D010995:Pleural Diseases / Q000175:diagnosis*; D010996:Pleural Effusion / Q000175:diagnosis; D010997:Pleural Neoplasms / Q000175:diagnosis; D010998:Pleurisy / Q000175:diagnosis; D014463:Ultrasonography