title: Metanephric adenofibroma: robotic partial nephrectomy of a large Wilms' tumor variant.
abstract: OBJECTIVE
  A case of the rare, benign, Wilms' tumor (WT) variant, metanephric adenofibroma (MAF), is presented.
  
  
  METHODS
  The patient is a 21-year-old female with an incidentally discovered enhancing renal mass. The diagnosis, workup and treatment are outlined.
  
  
  RESULTS
  The 19 cm renal mass was ultimately resected via robot-assisted partial nephrectomy. Pathologic diagnosis at our institution was confirmed as a MAF by the National Wilms' Tumor Study Group (NWTSG).
  
  
  CONCLUSIONS
  Difficult to differentiate from WT, it is imperative that MAF be recognized and appropriately diagnosed because unlike adult WT, the natural history of MAF is indolent and adjuvant chemo/radiation therapy is rarely necessary. This case reinforces the importance of review of potential WT variants by the NWTSG.
authors.affiliation: Drexel University College of Medicine, Philadelphia, Pennsylvania, USA.
authors.forename: Zachary
authors.initials: Z
authors.lastname: Piotrowski
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Canter
authors.forename: Alexander
authors.initials: A
authors.lastname: Kutikov
authors.forename: Tahseen
authors.initials: T
authors.lastname: Al-Saleem
authors.forename: Jianming
authors.initials: J
authors.lastname: Pei
authors.forename: Joseph R
authors.initials: JR
authors.lastname: Testa
authors.forename: Robert G
authors.initials: RG
authors.lastname: Uzzo
mesh_terms: D000232:Adenofibroma / Q000473:pathology / Q000601:surgery*; D005260:Female; D006801:Humans; D007680:Kidney Neoplasms / Q000145:classification / Q000473:pathology / Q000601:surgery*; D009392:Nephrectomy / Q000379:methods*; D012371:Robotics; D009396:Wilms Tumor / Q000145:classification / Q000473:pathology / Q000601:surgery*; D055815:Young Adult