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. 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
Inverted papillomas are definitively diagnosed by histologic examination.
However, Magnetic Resonanace Imaging may show a characteristic feature described
as a Convoluted Cerebriform Pattern. 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. References
^ Jeona, T.Y.; H.-J. Kima, S.-K. Chungb, H.-J. Dhongb, H.Y. Kimb, Y.J. Yima, S.T.
Kima, P. Jeona and K.H. Kima. “Sinonasal Inverted Papilloma: Value of Convoluted
Cerebriform Pattern on MR Imaging”. American Journal of Neuroradiology 29:
1556–1560. doi:10.3174/ajnr.A1128. PMID 18499786.
External links Inverted papilloma entry in the public
domain NCI Dictionary of Cancer Terms Additional images
This article incorporates public domain material from the U.S. National Cancer
Institute document “Dictionary of Cancer Terms”.