CTICasesDiaphragmatic Eventration
Imaging findings
Chest radiograph demonstrates a steep, rounded elevation of the right hemidiaphragm, particularly prominent anteriorly and posteriorly. Chest CT shows colonic interposition beneath the elevated right hemidiaphragm. The muscular diaphragm is extremely thin at the dome, but the right and left diaphragmatic crura are hypertrophied in an obese patient with a BMI of 36, without signs of crus atrophy.
Key takeaways
Diaphragmatic eventration is a congenital developmental anomaly characterized by focal thinning and weakening of the diaphragmatic muscle, leading to elevation of the abdominal viscera. It is distinguished from diaphragmatic paralysis on CT by the absence of diaphragmatic crus atrophy. Eventration typically produces a steep arc on lateral radiographs, whereas paralysis results in a shallower, flat arc.
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