Split Pleura Sign

A finding by contrast-enhanced CT in which the visceral (inner) and parietal (outer) pleurae are enhanced and separated by a parapneumonic effusion around a less-dense empyema in a setting of bacterial pneumonia
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Empyemas are purulent pleural collections most readily recognized on imaging by the split pleura sign. The split pleura sign represents a rind of visceral and parietal pleural thickening surrounding a loculated effusion (Figure 13).