What is the anatomy of Wilms tumor?

Updated: Feb 01, 2019
  • Author: Tunc Ozan, MD; Chief Editor: Bradley Fields Schwartz, DO, FACS  more...
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Wilms tumor arises from the primitive embryonal renal tissue. Grossly, Wilms tumor is typically an intrarenal solid or cystic mass, which may displace and, in rare cases, invade the renal collecting system. The tumor extends into the renal vein in 40% of cases. In very rare cases, it extends into the ureter and down to the bladder, where it may cause hematuria. Wilms tumor is bilateral in 6% of cases. Local invasion is rare and tumor spread is usually through lymphatic and vascular routes.

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