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Fig. 5. —45-year-old woman with interfascial fluid spread in acute pancreatitis and retrorenal dissection of fluid in lumbar triangle. Note fluid in left anterior interfascial space (straight open arrow), lateroconal interfascial space (curved open arrow), and posterior interfascial space (curved solid arrow). Fluid extends to and thickens transversalis fascia (straight solid arrow), dissecting quadratus lumborum muscles and posterior pararenal fat (arrowhead). This is source of Grey Turner's sign of pancreatitis.