Lumbocostal triangle (Bochdalek's triangle)
trigonum lumbocostale
An area without muscle in the back of the diaphragm, between the costal part and the lumbar part: it lies between the tip of the 11th rib and the 12th rib, just above the lateral arcuate ligament (which passes over the quadratus lumborum).

In the full entry
The full entry, with every field, sources, quiz and clinical correlations, is in the atlas.
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Related clinical cases
- Rupture of the diaphragm and diaphragmatic hernia