The diagnosis of ureteral obstruction caused by endometriosis can be d
ifficult. We present a 51-year-old multiparous Japanese woman who had
undergone right salpingo-oophorectomy at the age of 19 years. She unde
rwent total hysterectomy, left salpingo-oophorectomy, and adhesiotomy
of the right ureter after the diagnosis of myoma uteri and endometrios
is was made. Microscopic examination of the surrounding resected tissu
e confirmed the typical endometriotic origin. In addition to intraveno
us and retrograde pyelography, computerized tomography was useful to e
stablish the diagnosis of ureteral obstruction caused by an extrinsic
mass of endometriotic tissue.