<prompt> Bochdalek hernia occurs throughDiaphragmLumbar triangleFemoral regionobturator canal  <response>: A hernia through foramen Bochdalek through the pleuroperitoneal canal 95 left-sided, only 5 right sided It is a commonest congenital diaphragmatic hernia. This is a developmental defective condition, due to a failure of fusion of pleuroperitoneal canal leaving a direct communication between pleura and peritoneum on left side. This allows herniation of contents of the abdomen into the left side thorax. Common content is a colon. Occasionally small bowel, stomach is the contents. 80 cases do not have a hernial sac. Only 20 cases have got sac. Ref: SRB;s manual of surgery,3 rd ed, pg no 1078 