General
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• Also called transitional cell carcinoma
• Rare; resembles counterpart in bladder (Am J Surg Pathol 1995;19:1138)
• Often presents at advanced clinical stage
• May represent subgroup of squamous cell carcinoma

Case reports
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• 38 year old woman with coexisting papillary adenocarcinoma (Pathol Int 2004;54:63)
• 60 year old woman with pyometra (pus in uterine cavity) (Indian J Pathol Microbiol 2004;47:71)

Micro description
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• Often exophytic, may have inverted pattern

Micro images
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Renal pelvis

Bladder

Cytology description
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• See Cervix - cytology

Positive stains
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• CK7

Negative stains
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• CK20

Molecular description
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• Often HPV16+ (Gynecol Oncol 1999;74:361)

Differential diagnosis
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• Inverted urothelial papilloma
• Papillary lesions of cervix

Additional references
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• Am J Surg Pathol 1995;19:1138

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