Nephrogenic adenoma arising from a urethral diverticulum: magnetic resonance features.

Nephrogenic adenoma is a rare benign tumor of the urinary tract. Although its most commonly arises within the urinary bladder, this tumor may also occur within a urethral diverticulum. We report the magnetic resonance imaging (MRI) findings of a nephrogenic adenoma arising within a urethral diverticulum in a 43-year-old woman. MRI appears to be helpful in showing the anatomic extent of the lesion as well as differentiating it from other anterior vaginal wall masses.