Hydrosalpinx (Fluid-Filled Fallopian Tube)

What a hydrosalpinx is

Each fallopian tube carries the egg from the ovary to the uterus and is where sperm and egg meet. The far end of the tube has finger-like projections (fimbriae) that sweep up the egg. If infection or inflammation scars those fimbriae together, the tube seals shut. The tube's lining keeps producing fluid that cannot drain, so the tube swells into a sausage-shaped, fluid-filled sac. The name means "water in the tube".

The lining can also be damaged, losing the hair-like cells that move the egg. This damage determines whether the tube can ever work normally again.

Causes

• Pelvic inflammatory disease (PID): the commonest cause, usually from chlamydia or gonorrhea, which are often silent. Each episode of PID raises the chance of tubal damage.
• Endometriosis: adhesions can block the tube.
• Previous pelvic or abdominal surgery, including surgery for ectopic pregnancy, ovarian cysts or fibroids.
• Ruptured appendix or other abdominal infection.
• Tuberculosis of the genital tract, in regions where TB is common.
• Previous tubal sterilization, occasionally.

Symptoms

Many people have none. When present they include:

• dull or crampy pelvic pain, often on one side, sometimes worse during or after periods
• watery vaginal discharge in a few cases
• pain during sex
• difficulty getting pregnant

Hydrosalpinx and pregnancy

A hydrosalpinx affects fertility in several ways:

• Natural conception: a blocked tube cannot pick up the egg. If both tubes are blocked, natural pregnancy is very unlikely.
• Ectopic pregnancy: a partly damaged tube can catch a fertilized egg, so the embryo implants in the tube. See ectopic pregnancy.
• IVF: fluid from the tube leaks back into the uterus, where it is toxic to embryos and can wash them away. Studies show a hydrosalpinx roughly halves IVF pregnancy rates and raises miscarriage risk. Removing or blocking the affected tube restores IVF success to about normal levels.

How a hydrosalpinx is diagnosed

1. Transvaginal ultrasound: may show a sausage-shaped, fluid-filled tube with folds, distinct from an ovarian cyst. Small ones are often missed.
2. Hysterosalpingogram (HSG): dye is passed through the cervix and an X-ray shows whether it flows freely out of the tubes. A swollen tube with no spill confirms blockage.
3. HyCoSy: a similar test using ultrasound and foam instead of X-rays.
4. Laparoscopy with dye test: keyhole surgery that views the tubes directly and can treat the problem at the same time.
5. STI tests for chlamydia and gonorrhea, and treatment of any active infection before procedures.

Treatment

The best option depends on whether you want to become pregnant and how damaged the tubes are.

Before IVF

• Laparoscopic salpingectomy (tube removal): the standard approach, recommended by fertility societies when a hydrosalpinx is visible on ultrasound. It improves IVF pregnancy rates.
• Proximal tubal occlusion: clipping the tube close to the uterus, used when removal would be risky because of dense adhesions.
• Ultrasound-guided drainage of fluid at egg retrieval is a temporary measure, as fluid tends to return.

Tube repair surgery

Neosalpingostomy opens the blocked end of the tube to restore a pathway. It suits only younger people with a single, mild hydrosalpinx and healthy lining, and it carries a raised ectopic pregnancy risk. For most others, IVF after salpingectomy gives better pregnancy chances.

No pregnancy plans

A hydrosalpinx without symptoms may not need treatment. Persistent pain may be treated by removing the tube.

Antibiotics

Antibiotics treat active infection but do not unblock or shrink a hydrosalpinx.

Prevention

• Use condoms with new or multiple partners.
• Have regular chlamydia and gonorrhea screening: CDC advises yearly testing for sexually active women under 25 and older women at increased risk.
• Get prompt treatment for pelvic pain with fever or abnormal discharge, and make sure partners are treated too.

Frequently asked questions

Can you get pregnant with a hydrosalpinx?

It is possible if only one tube is affected and the other is healthy, but chances are reduced and the ectopic risk is higher. With blockage on both sides, natural pregnancy is very unlikely, and IVF after treating the tubes is usually recommended.

Why remove a hydrosalpinx before IVF?

Fluid from the swollen tube flows back into the uterus, where it interferes with embryo implantation and can flush embryos out. Removing or blocking the tube roughly doubles the chance of IVF success compared with leaving it in place.

Can a hydrosalpinx go away on its own?

Rarely. The blocked tube end does not reopen by itself, and fluid usually persists or returns after drainage. Antibiotics treat infection but do not clear the blockage. Surgery is the only way to remove or repair it.

Does a hydrosalpinx cause pain?

Often not. Some people have a dull ache on one side of the pelvis, pain around periods or during sex. Sudden severe pain may mean the tube has twisted or that there is an ectopic pregnancy, and needs emergency care.

Is a hydrosalpinx caused by an STI?

Often, but not always. Past chlamydia or gonorrhea leading to pelvic inflammatory disease is the most common cause, frequently from an infection that never caused symptoms. Endometriosis, previous surgery and appendicitis can also cause it.