Fig. 2
From: Sonographic findings of thoracic empyema: outcome perspectives
The chest ultrasound patterns of empyema patients. Top left: A group (I)—complex non-septated and relatively hyperechoic pattern. Top right: B group (II) or group (III)—complex septated effusion (either fixed or mobile septa). Bottom: C group (IV)—homogenously echogenic pattern, with echogenic spot density in the pleural fluid