1、The Diaphragmatic Crura and Retrocrural SpaceNormal Imaging Appearance,Variants,and Pathologic ConditionsGuo Xiaochao2010.7.22RadioGraphics 2008;28:1289-1305 The retrocrural space(RCS)is a small triangular region within the most inferior posterior mediastinum bordered by the two diaphragmatic crura.
2、Multiplanar imaging modalities allow evaluation of the RCS as part of routine examinations.Normal structures within the retrocrural region include the aorta,nerves,the azygos and hemiazygos veins,the cisterna chyli with the thoracic duct,fat,and lymph nodes.Anatomic Considerations Diaphragm and Diap
3、hragmatic Crura Lymph Nodes,Cisterna Chyli,and Thoracic Duct 52%at lymphangiography;1.7%at CT;15%96%at MR Aorta Azygos and Hemiazygos Veins Paravertebral Venous Plexus valveless Sympathetic Trunk and Splanchnic Nerves Cisterna Chyli&Thoracic Duct Paravertebral Venous Plexus Congenital diaphragmatic
4、hernia Bochdalek hernia(95%)Morgagnis hernia(2%)Partial duplication of the diaphragm Discontinuity of the diaphragm Congenital Anomalies of the IVCAnatomic Variants and AnomaliesAbnormalities of the Crura Lymphadenopathy Neoplasms Foregut Malformations Vascular Disorders Infammatory Conditions Infec
5、tions Other AbnormalitiesAbnormalities of the RCS Lymphadenopathy (6mm)NeoplasmsThese can be categorized according to their cell of origin into neurogenic,mesenchymal,germ cell,and lymphoid tumors.Neurogenic tumorsganglion cell tumorsnerve sheath tumorsparaganglia Vascular DisordersInfammatory ConditionsRetroperitoneal fbrosisSteroid-induced retrocrural lipomatosisSpondylosis deformansPancreatic pseudocysts
