TL;DR
My HSG "no filling + venous extravasation" is the classic picture of proximal tubal occlusion (blocked at the uterine end), not frank hydrosalpinx (fluid-filled, dilated distal tube). HSG cannot see whether the distal tube is dilated — that's the embryo-toxic finding. I need a dedicated transvaginal ultrasound looking specifically for hydrosalpinx before my next transfer. If negative, no surgery; IVF bypasses proximal occlusion entirely. If positive, laparoscopic salpingectomy is the best-supported intervention and doesn't impair ovarian response.
Papers
Diagnostics · 2023
Delgado-Morell A et al. Transvaginal ultrasound accuracy in the hydrosalpinx diagnosis: a systematic review and meta-analysis
PMC
Finding: TVUS for hydrosalpinx has pooled sensitivity 84% and specificity 99% (positive likelihood ratio 80.7). Diagnostic finding: a dilated, fluid-filled, C- or S-shaped tubular structure >10 mm, distinct from the ovary.
Cochrane · 2022 (protocol)
Tros R et al. Visual tubal patency tests for tubal occlusion and hydrosalpinx
PMC
Finding: HSG and HyCoSy localize where a tube is blocked but cannot characterize what's beyond the block — meaning they can't distinguish frank hydrosalpinx from simple proximal occlusion. Laparoscopy with chromopertubation is the reference standard.
Ultrasound Obstet Gynecol · 2025
Pérez-Milán F et al. Hydrosalpinx treatment before in vitro fertilization: systematic review and network meta-analysis
PMC
Finding: For confirmed hydrosalpinx, salpingectomy ranks highest for ongoing pregnancy (OR 4.35, 95% CI 1.70–11.14) and does not impair ovarian response. Proximal tubal occlusion (clipping) is a close second (clinical pregnancy OR 2.55). Ultrasound-guided aspiration has a smaller, shorter-lived effect. No intervention is indicated for tubes that are NOT dilated.
Summary
The diagnostic gap
HSG and HyCoSy are good at saying "this tube is blocked" but not at saying "the blocked tube is full of toxic fluid." Only the latter harms IVF outcomes. The embryo-toxic mechanism is mechanical washout + cytotoxic fluid leaking back into the uterus — that requires a dilated distal tube. Proximal occlusion alone doesn't create that fluid.
Decision tree for my next cycle
- Request a dedicated TVUS for hydrosalpinx at the first CZ clinic visit. Operator should look for a dilated, fluid-filled, elongated structure >10 mm separate from the ovary, bilaterally.
- If TVUS is negative: no intervention. IVF bypasses proximal occlusion. Proceed to stim and transfer.
- If TVUS shows hydrosalpinx: discuss laparoscopic salpingectomy before the first transfer. Best evidence; doesn't harm AMH/AFC.
- If TVUS is equivocal: saline infusion sonography or MRI; diagnostic laparoscopy as the reference standard (and can treat in the same session).
Relation to my history
The HSG report itself flagged that I "may be amenable for bilateral fallopian tube recanalization." That's a procedure for proximal occlusion — which suggests the radiologist also read this as proximal block, not hydrosalpinx. The 2022 HyCoSy showed bilateral patency, so this is new pathology (likely subclinical infection or inflammation in the intervening years). Either way: the missing test is TVUS for hydrosalpinx, not recanalization.
Confidence: how well each finding applies to me
| Finding | Confidence | Note |
|---|
| My HSG is consistent with proximal occlusion, not hydrosalpinx |
High |
"No filling + venous extravasation" is textbook proximal block. |
| TVUS is the appropriate next test (sens 84%, spec 99%) |
High |
Standard non-invasive workup. Every clinic on my shortlist has in-clinic ultrasound. |
| If hydrosalpinx is confirmed, salpingectomy is the best-supported pre-IVF intervention |
High |
Effect size large; ovarian-reserve concern not supported by current data. |
| If TVUS is negative, no tubal surgery is needed |
High |
IVF bypasses tubes entirely. Proximal occlusion alone is not embryo-toxic. |
| The LBR-specific benefit of intervention is smaller than older trials suggested |
Medium |
2025 NMA: ongoing pregnancy improves, LBR signal is not statistically significant in RCT-only pool. |
Questions to raise with each CZ clinic
- Can you perform a dedicated transvaginal ultrasound to assess for hydrosalpinx at my first visit, looking specifically for a dilated fluid-filled tube?
- If hydrosalpinx is confirmed, would you recommend laparoscopic salpingectomy before my first transfer? Can it be done in-house or do I need a referral?
- What's your protocol if the TVUS is equivocal — repeat imaging, MRI, or proceed straight to diagnostic laparoscopy?
- What's the timing — how many weeks before retrieval / transfer should any tubal surgery happen?
Caveats
- The Pérez-Milán 2025 NMA found no statistically significant live-birth benefit in the RCT-only analysis — only clinical and ongoing pregnancy improved. ESHRE / ASRM still recommend intervention because the implantation signal is consistent.
- Most evidence on intervention pre-dates modern IVF lab practices (vitrification, blast culture, single-embryo transfer), so the absolute effect size today may be smaller than older trials suggested.