Bladder, ureter & renal pelvis

Urothelial neoplasms - noninvasive

Flat lesions with atypia of unknown significance



Topic Completed: 1 June 2016

Minor changes: 1 November 2021

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PubMed Search: Flat lesions with atypia

Monika Roychowdhury, M.D.
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Cite this page: Roychowdhury M Flat lesions with atypia of unknown significance. PathologyOutlines.com website. https://www.pathologyoutlines.com/topic/bladderflatatypiaunknown.html. Accessed December 3rd, 2021.
Definition / general
  • Atypia between reactive and dysplasia
  • More pleomorphism and hyperchromasia than expected for the amount of inflammation present
  • Recommend close follow up and reevaluation after inflammation subsides
Differential diagnosis
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