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Retroperitoneal Cysts
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- Benign retroperitoneal cysts are usually mesothelial or mesonephric in origin; rarely, rupture of the biliary tree can result in bile-filled cysts
- Gross features: by definition, these cysts are not connected to the kidney or adrenal; usually filled with clear or straw-colored fluid.
- Histologic features: these cystic structures may be lined by mesothelial, enteric (glandular), or columnar epithelium.
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