Tags: Disease.
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.
