Faces of Inherited Disease Polycystic Kidney Disease Polycystic Kidney DiseaseCT scan without contrast of a 52 year old male with polycystic kidney disease shows extensive replacement of renal parenchyma by cystic disease with many high density cysts suggesting hemorrhage. Extensive polycystic liver disease is also presentAshley Davidoff MD TheCommonVein.net Medullary Sponge Kidney CT Medullary Sponge Kidney34-year-old male presented with hematuria. CT in the coronal plain shows small, punctate, or linear densities within the region of the renal papilla bilaterally. The type and distribution of the calcifications are characteristic of medullary sponge kidney (MSK)Ashley Davidoff MD TheCommonVein.net 127824c