Urinary System pp 399-403 | Cite as

Papilloma, Urinary Bladder, Rat

  • Tomoyuki Shirai
  • Satoru Takahashi
Part of the Monographs on Pathology of Laboratory Animals book series (LABORATORY)


The tumors usually appear as single or multiple small, nodular lesions on the mucosal surface of the urinary bladder. They are exophytic and polypoid projecting from the mucosal surface,with a narrow or a broad base. Papillomas may be located in any region of the bladder wall. Some tumors may have a smooth surface. On the serosal side, dilated blood vessels distributing to the tumor site may be present. The multiplicity of the lesions depends on the causative factors; potent carcinogens tend to induce many lesions, whereas less carcinogenic stimuli may result in fewer or single lesions


Transitional cell papilloma inverted papilloma 


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© Springer-Verlag Berlin Heidelberg 1998

Authors and Affiliations

  • Tomoyuki Shirai
  • Satoru Takahashi

There are no affiliations available

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