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Hernias can happen at naturally-occurring openings in the diaphragm, such as where the esophagus passes through (in the muscular part of the diaphragm, as opposed to the IVC which passes through the central tendon). Another reason that hernias may happen in certain parts of the diaphragm relates to the complexity of formation of the organ, from many different pieces that must all come together perfectly. If they do not join completely, this may leave a weak spot, as in the case of Bochdalek hernia. Understanding development of anatomic structures can be very helpful in understanding diseases, particularly congenital problems like Bochdalek hernias.
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