[A case of extramammary Paget's disease with urethral invasion treated by construction of continent urinary diversion based on the Monti principle using the sigmoid colon].

Extramammary Paget's disease occurring in the female vulva is occasionally associated with invasive disease to urethra and bladder mucosa. For such cases, ensuring adequate surgical margin is essential. Not only adequate removal of tumor, but also urinary diversion is important for patient's quality of life.