Sandbox: DDx Kidney mass

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  • Incidental finding , 50 yo male
  • Asymptomatic
  • May havee hematuria and flank pain if ruptured
  • Clear to straw-colored fluid


  • Oval shape anechoic mass with variable sizes on U/S
  • Well-marginated lesion with thin smooth walls
  • Strong posterior acoustic enhancement
  • Cyst surrounded by a single layer of flattened , cuboidal, or atrophic epithelium










Nonmalignant causes

acquired cystic kidney disease  cystic renal dysplasia glomerulocystic kidney  mesothelial cysts nephronophthisis 

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