costal line of pleural reflection
Definition: surface projection of the sharp line along which the costal part of the parietal pleura becomes continuous with the diaphragmatic part inferiorly; this line intersects midclavicular line at the level of the eighth rib, the midaxillary line at the level of the tenth rib, and the paravertebral line at the level of the twelfth rib; thoracentesis is performed one rib level higher in these lines.
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