Definition: 'Lumbocostal Triangle Of Diaphragm'
lumbocostal triangle of diaphragmType: Term
1. 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.
The definition information for lumbocostal triangle of diaphragm is provided by Stedman's. You can search our medical dictionary here.