Inverted papilloma

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Inverted papilloma
Inverted papilloma high mag.jpg
Micrograph of an inverted papilloma of the urinary bladder. H&E stain.
Classification and external resources
ICD-O 8053/0

An inverted papilloma is a type of tumor in which surface epithelial cells grow downward into the underlying supportive tissue. It may occur in the nose and/or sinuses or in the urinary tract (bladder, renal pelvis, ureter, urethra). When it occurs in the nose or sinuses, it may cause symptoms similar to those caused by sinusitis, such as nasal congestion. When it occurs in the urinary tract, it may cause blood in the urine.

Diagnosis By MRI[edit]

Inverted papillomas are definitively diagnosed by histologic examination. However, Magnetic Resonanace Imaging (MRI) may show a characteristic feature described as a Convoluted Cerebriform Pattern (CCP). A retrospective study published in the American Journal of Neuroradiology concluded that identification of CCP by MRI in a patient with a nasal tumor made the diagnosis of Inverted papilloma quite likely. The study reported the sensitivity and specificity to be 100% and 87% respectively. CCP can be associated with other malignant tumors as well.[1]


  1. ^ Jeon TY, Kim HJ, Chung SK, Dhong HJ, Kim HY, Yim YJ, Kim ST, Jeon P, Kim KH (May 22, 2008). "Sinonasal Inverted Papilloma: Value of Convoluted Cerebriform Pattern on MR Imaging". American Journal of Neuroradiology. 29 (8): 1556–1560. doi:10.3174/ajnr.A1128. PMID 18499786. 

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 This article incorporates public domain material from the U.S. National Cancer Institute document "Dictionary of Cancer Terms".