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Trans-diaphragmatic Pathologies: Anatomical Background and Spread of Disease on Cross-sectional Imaging.

The diaphragm is not only a sheet of muscle separating the abdominal and thoracic cavities: it plays an essential role in ventilation and can act as a gateway for the spread of different disease processes between the abdominal and the thoracic cavity. Careful attention to the appearance of the diaphragm on various imaging modalities is essential to ensure the accurate diagnosis of diaphragmatic disorders, which may be secondary to functional or anatomical derangements.