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Eventration of the diaphragm. Caused by a thinned and weakened section of diaphragm - often congenital - permitting abdominal contents to bulge towards the thoracic cavity. While eventration may cause respiratory distress in the newborn, adults are often asymptomatic. The distinction between a localized eventration or a pathological mass is best made using CT or MRI.
Source
Clinical Imaging: An Atlas of Differential Diagnosis. 5th ed.
Adam: Grainger & Allison's Diagnostic Radiology, 5th ed.