Diaphragmatic eventration is a rare entity in the adult population, and usually asymptomatic 1 ; our case is a young man with severe right-sided diaphragmatic eventration with huge dilated colon that has compromised the right hemithorax and caused complete lung collapse and mediastinal shift similar to tension pneumothorax picture with haemodynamic alteration. A single similar case report had been published but did not shed the light on the accurate description of the pathophysiological mechanism of the disease. We believe that such a high abdominal pressure that has transmitted to the thoracic cavity due to the pliable diaphragm causing such a derangment in both the anatomy and the physiology deserves reporting and we think that the term ‘thoracoabdominal compartment syndrome’ describes it accurately, so we discuss some learning points from our case and things that could have been done better.
As we advance our knowledge in understanding abdominal compartment syndrome, it is worth going back to revisit our basic embryologic development of the main determinant of the abdominal and thoracic cavities, i.e., the diaphragm. The abdominal and thoracic cavities used to be one cavity at some stage of the embryonic life — “intraembryonic coelom” — before the “septum transversum” — diaphragmatic origin — divided it into two cavities. Therefore, if a condition develops that will impair the diaphragm from separating the cavities, leading to the possibility of pressures to transmit from one cavity to another, this becomes relevant as abdominal compartment syndrome. Diaphragmatic eventration is a congenital developmental defect in the muscular portion of the diaphragm with preserved attachments to the sternum, ribs, and dorsolumbar spine, leading to a semi-membranous diaphragm that anatomically separates the two cavities, but not physiologically. In the case of high abdominal pressure, the pressure will transmit to the thoracic cavity, causing derangement in both the anatomy and physiology. This was reported and named “Thoracoabdominal Compartment Syndrome”.
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