Hydrosalpinx: Essential Guide 2026

Hydrosalpinx is a fallopian tube that has become blocked at its far end and filled with fluid. It is one of the few findings on a fertility scan that genuinely changes what we recommend, because the fluid itself interferes with implantation — and it is also one of the few where a straightforward operation makes a measurable difference. This page explains how it is found, what it means, and what the options are.

On this page

• What hydrosalpinx means
• How it is found
• What causes it
• How hydrosalpinx affects fertility and IVF
• Surgery and the alternatives
• If only one tube is affected
• Ectopic pregnancy risk
• When no operation is needed
• Questions patients ask

What hydrosalpinx means

The fallopian tube ends in a fringe of finger-like projections that sweep the egg in from the ovary. When infection or surgery scars that fringe closed, the tube seals at the outer end. The lining keeps producing fluid, the fluid has nowhere to drain, and the tube swells into a sausage or retort shape. That is a hydrosalpinx.

Two things have now gone wrong. The tube can no longer collect an egg, so natural conception on that side is not possible. And the collected fluid can track backwards into the uterus, where it is hostile to an implanting embryo.

The word is singular; two affected tubes are hydrosalpinges.

How it is found

Most cases are found during a routine fertility work-up, because a hydrosalpinx usually causes no symptoms at all. Some women have a dull one-sided ache or a watery discharge; most have nothing.

• Transvaginal ultrasound may show a tubular, fluid-filled structure beside the ovary, sometimes with incomplete internal septations and a cogwheel appearance
• An HSG test shows the dye filling a dilated tube with no spill at the end — the classic picture
• HyCoSy or HyFoSy gives similar information using ultrasound contrast
• Laparoscopy confirms it directly and allows treatment in the same sitting

A small hydrosalpinx can be missed on ultrasound and only appear on tubal imaging, which is one reason we do not rely on a scan alone to declare the tubes normal.

Reports vary in how they phrase it. “Dilated tube with no peritoneal spill”, “retort-shaped adnexal cystic structure”, “tubo-ovarian complex” and “blocked tube with fluid collection” are all describing the same thing. Ask whether the dilated segment was measured, and whether one or both sides were involved — those two details drive the decision that follows.

What causes it

Pelvic infection is the dominant cause worldwide, and chlamydia is the organism most often responsible. The infection may have been silent years earlier; many women with tubal damage have no recollection of ever being unwell. The NHS page on pelvic inflammatory disease explains how quietly this can happen.

Other routes are tuberculosis of the genital tract, which remains a relevant cause in India; endometriosis; previous ruptured appendix; and adhesions after pelvic or caesarean surgery. Occasionally the tube is damaged by a previous ectopic pregnancy or by earlier tubal surgery, including attempted reversal of sterilisation.

How hydrosalpinx affects fertility and IVF

This is the part that matters. The fluid is not inert. It contains inflammatory cytokines and debris, it can wash into the uterine cavity, and it appears to impair both the endometrium and the embryo.

The effect on IVF is well documented. A widely cited meta-analysis found that in women with untreated hydrosalpinges, clinical pregnancy and implantation after IVF were roughly halved, and early pregnancy loss roughly doubled, compared with women who had tubal disease without fluid (Camus and colleagues, 1999). A Cochrane review of surgical treatment before IVF found significantly higher odds of ongoing pregnancy after laparoscopic removal of the affected tube.

Put plainly: a hydrosalpinx left in place works against an otherwise well-run cycle, and dealing with it first is not an optional extra.

Surgery and the alternatives

Three approaches exist, in descending order of preference:

• Laparoscopic salpingectomy — removal of the affected tube. The standard operation, day-care, and the option with the strongest evidence behind it
• Proximal tubal occlusion — clipping or dividing the tube where it meets the uterus, leaving the tube in place. Used when dense adhesions make removal unsafe
• Salpingostomy — opening the blocked end to restore drainage. Preserves the tube but often reseals, and is reserved for mild disease in younger women

Salpingectomy for a hydrosalpinx does not reduce ovarian reserve when performed carefully, because the blood supply to the ovary is preserved. That is a common fear and a reasonable question to ask your surgeon directly.

Aspirating the fluid with a needle at egg collection is sometimes offered. It is quicker, but the fluid usually reaccumulates within weeks, so it is a temporary measure rather than a solution.

If only one tube is affected

A unilateral hydrosalpinx still leaks fluid into the shared uterine cavity, so the argument for removing it before an embryo transfer holds even when the other tube is healthy. Natural conception through the normal tube remains possible after surgery.

Where both tubes are affected, removal means natural conception is no longer possible and IVF becomes the route. That is a genuinely difficult conversation, and it should be had properly rather than in passing. Our page on fallopian tube problems sets out the wider picture.

Ectopic pregnancy risk

A damaged but partly open tube can trap an embryo, and women with tubal disease carry a higher risk of ectopic pregnancy both naturally and after IVF. Removing a hydrosalpinx lowers that risk on the treated side.

If you conceive with known tubal disease, an early scan at six to seven weeks to confirm the pregnancy is inside the uterus is not optional. Sudden one-sided pain, shoulder-tip pain or fainting needs emergency assessment the same day.

When no operation is needed

Not every fluid-filled structure beside an ovary is a hydrosalpinx. Paraovarian cysts, a dilated pelvic vein and a small ovarian cyst can all mimic one on a single scan, and a repeat scan in a different phase of the cycle often resolves the question.

A very small, non-dilated tube that shows delayed spill rather than no spill is not the same problem and usually needs nothing. Surgery is also reconsidered where a woman is close to natural menopause, or where she is not proceeding to transfer, because the argument for removal rests on protecting an embryo.

At Jananam both partners are evaluated before a plan is made, and add-ons are offered selectively rather than routinely, so the decision to operate is taken on the imaging and the treatment plan in front of us, not as a reflex. The NICE fertility guideline CG156 sets out the evidence base for tubal surgery before IVF.

Questions patients ask

Can medicine cure a hydrosalpinx?

No. Antibiotics treat active infection but cannot reopen a scarred tube or clear trapped fluid. Where genital tuberculosis is confirmed, treatment is essential but does not restore tubal function.

How long after surgery can we start IVF?

Usually four to six weeks, once you have recovered. There is no benefit in waiting longer.

Will it come back?

Not if the tube has been removed. After salpingostomy, resealing is common, which is the main argument against that operation.

Does it cause pain?

Often not at all. When a hydrosalpinx is painful, it tends to be a dull, intermittent ache on one side rather than anything sharp.

Written and medically reviewed by Dr. Vani Sundarapandian, MD, DGO, FRCOG (UK) — founder and Medical Director, Jananam Fertility Centre, Chennai.