Table 5 Other signs described in pleural effusion [8, 37, 38]
From: Lung ultrasound—a primary survey of the acutely dyspneic patient
Signs | Cause | Significance |
|---|---|---|
Quad sign | Pleural effusion | Shape of effusion collection |
Spine sign | Large effusion | Large effusion allowing visualisation of the spine |
Plankton sign | Blood, fibrin | Hemothorax, exudate |
Air-fluid level | Air | Air within effusion |
Jellyfish sign | Compressive atelectasis | No consolidation of underlying lung |
Sinusoid sign | Jellyfish sign in M-mode | No consolidation of underlying lung |
Suspended microbubble sign | Air within lung abscess | Distinguish lung abscess from empyema |