Cholecystitis - CT IVP obstructive choledocholitiasis
Upper abdominal pain - cholecystitis + stone on external ultrasound.
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CT intravenous cholangiography (CT Cholangiography)
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The gallbladder is distended, showing a 2.6 cm calcified stone within, thick walls, and surrounding fat-stranding and free fluid. The common biliary duct is enlarged in calibre (11mm) and demonstrates ill defined filling defects within its distal portions (measuring up to 8 mm on axial plane).
Within the limitations of a non-contrast study the remainder of the imaged upper abdominal content appears unremarkable.
Conclusion: Choledocholithiasis associated with cholecystitis.