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Fig. 6B Afferent loop obstruction in 50-year-old man. Axial CT image
after Whipple procedure shows valvulae conniventes in uniformly dilated
afferent loop (black arrows) confirming diagnosis of afferent-loop
obstruction rather than pseudocyst. Back pressure from afferent-loop
obstruction can cause biliary or main pancreatic duct dilation (not
shown).