Diaphragmatic Undulation Mimicking an Intra-thoracic Mass in a Newborn

摘要

Diaphragmatic embryo-genesis is between gestational weeks 4 and 12. Transverse septum, pleuroperitoneal membranes, mesentery of the esophagus, thoracic intercostal muscle groups gives rise to anterior central tendon, dorsolateral portions, dorsal crus and the muscular parts of the diaphragm respectively. Delays or changes occurring during this development lead to congenital diaphragmatic herniation or eventration.¹ Diaphragmatic undulation is a mild focal eventration formed by incomplete muscle development in one hemi-diaphragm without any muscle damage. It usually includes the liver and is located in the front, right side. On X-ray investigations, it has a shadow-like appearance in the right cardio-phrenic angle and must be differentiated from Morgagni hernias, lipomas, pericardial cysts and fat pads.