The cervix is the only structure that would result in bilateral blockade.

Invasive cervical carcinoma is associated with hydronephrosis and renal failure d/t CA spreading through uterine wall and into the bladder.

so I don't think the reason for bilateral hydronephrosis is because it invated the bladder or kidneys. it is probably due to obstruction. there is a cancer in the uterine side of cervix (uterine cervix) that is big and its pushing on the bladder and its obstruction the flow of urine in ureters to bladder, so the urine backs up to the kidney and causes bilateral hydronephrosis and hydronephrosis. the kidney and ureters are full of urine and the cannot empty it to the bladder because this mass in the cervix is pushing on bladder and opening of ureters and squeezing bladder to the pubic bone.

To get bilateral hydroureter/hydronephrosis there needs to be an obstructive mass of some type at the level of the bladder or FURTHER downstream. Cervical CA is the only reasonable option of those listed (highly unlikely to have bilateral CA in the others)