An<unk>  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.
Inverted papilloma
Intraductal papilloma
Fibroadenoma
Trichoadenoma
Carcinoma in situ
Extramammary Paget's disease
Giant condyloma acuminatum
Condyloma