Fall from 3 meters high.
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Non contrast CT axial, coronal and sagittal images show biconvex hematoma, which displaces the parietal pleural and the extrapleural fat.
In addition multiple ribs fractures are seen.
Extrapleural hematoma is usually caused by trauma.
It is produced by rutpure of intercostal or internal mammary vessels. There is no interruption of the parietal pleura, which allows blood to stay in the extrapleural space.
It is usually associated with ribs fractures.
The typical image finding is a very thin hypodense line which represents the parietal pleura.