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165559 Pathology

A 69-year-old man with a history of recurrent pancreatitis treated with corticosteroids now has increasing fatigue for 2 years. He does not drink alcohol and has no evidence of gallbladder disease. On examination, there are no abnormalities. Laboratory studies show his serum creatinine is 5 mg/dL and urea nitrogen is 48 mg/ dL. His serum IgG4 is elevated. Ultrasound imaging shows bilateral hydronephrosis. What is abdominal CT imaging most likely to show in this man?

ANephrolithiasis
BPolypoid cystitis
CRetroperitoneal fibrosis
DRenal cell carcinoma
Pathology
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