Space
Costodiaphragmatic recess
Pleural extension below the resting lung edge
High-yield
The recess is part of the pleural cavity, not a separate sac. Its shape and occupancy change with breathing and posture.
Overview
This recess lies where the costal lining turns onto the diaphragm. Because the pleural boundary extends farther down than the resting lung, space remains for the inferior lung margin to move into during inspiration.
Reference facts
- Boundaries
- Between costal and diaphragmatic parietal pleura at the lower thoracic reflection
- Contents
- Pleural fluid and, during greater inspiration, the advancing inferior lung margin
- Communications
- Continuous above with the surrounding pleural cavity
Clinical correlation
Pleural fluid commonly collects in this dependent region and can blunt the costophrenic angle. The diaphragm and abdominal organs lie nearby, making their position relevant to pleural procedures.
Frequently asked questions
What are the boundaries of the costodiaphragmatic recess?
Between costal and diaphragmatic parietal pleura at the lower thoracic reflection.
What does the costodiaphragmatic recess contain?
The costodiaphragmatic recess contains the pleural fluid and, during greater inspiration, the advancing inferior lung margin.
What does the costodiaphragmatic recess communicate with?
The costodiaphragmatic recess communicates with the continuous above with the surrounding pleural cavity.