1825
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Lumbocostal triangle of diaphragm

A triangular area in the diaphragm between its lumbar and costal parts and superior to the lateral arcuate ligament that is devoid of muscle fibers; covered by pleura superiorly and by peritoneum inferiorly; when it fails to form congenitally (a closure defect of the fetal pleuroperitoneal hiatus), the consequent foramen of Bochdalek is the most common site of diaphragmatic hernia of abdominal viscera.
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