The embryo can be perfect — if the cavity it lands in isn't, cycles fail. The uterine causes standard scans miss, and how we find them before you spend on IVF.
✍️ By Dr. Patsama Vichinsartvichai, MD, MClinEmbryol, EFOG-EBCOG, EFRM-ESHRE/EBCOG, FACOG — Reproductive Medicine Specialist · Updated August 2026
Fertility workups often focus on eggs, tubes, and sperm — while the organ where implantation actually happens gets a quick 2D glance. Yet structural cavity problems are common in infertility and repeated miscarriage, and most are treatable in a single outpatient procedure. In my published research, systematic 3D scanning found a dysmorphic (T-shaped) uterine cavity in about 27% of infertility patients — the majority previously told their uterus was "normal."
A standard 2D scan shows slices — it cannot display the coronal plane, the "front view" of the cavity where shape abnormalities live. 3D transvaginal ultrasound reconstructs exactly that view, making a T-shape, septum, or distortion obvious. Adding saline (SIS) outlines polyps and adhesions sharply. It's painless, radiation-free, and done in the same visit.
A detailed structural scan with coronal-plane reconstruction, which I perform personally. About the scan · Who should have one.
When a finding needs confirmation or treatment: a slim camera enters the uterus without speculum or clamps — the vaginoscopy "no-touch" technique — usually without anesthesia.
Polypectomy, adhesiolysis, septum resection, or hysteroscopic metroplasty for the dysmorphic uterus — restoring a normal cavity shape before the next conception attempt or transfer.
The order matters: fixing the cavity before IVF protects the investment of every future embryo. It's one of the reasons a complete initial evaluation beats heading straight to stimulation.
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A congenital variant where the cavity is narrow and tubular instead of triangular. It's associated with infertility, implantation failure, and miscarriage, and is diagnosed on the coronal view of a 3D transvaginal ultrasound — a view 2D scans cannot produce. Selected cases benefit from outpatient hysteroscopic metroplasty.
Yes. Cavity-shape abnormalities like a T-shaped uterus or partial septum are routinely missed on 2D scans because the diagnostic view (the coronal plane) isn't visible. In our published series, about 27% of infertility patients had a dysmorphic cavity on 3D scanning.
It feels the same as a routine transvaginal scan and takes a few extra minutes for the 3D reconstruction. No radiation, no anesthesia. Saline infusion (SIS), when added, causes at most brief period-like cramping.
Strongly yes. Every embryo transferred into an abnormal cavity is an expensive missed opportunity. A 3D cavity assessment before starting IVF — or after any failed transfer — ensures the uterine side of the equation is genuinely normal.
Almost always. Polyps, adhesions, septa, and dysmorphic cavities are treated hysteroscopically — through the cervix, no incisions, typically as outpatient procedures with quick recovery. Selected fibroids can be treated with transvaginal radiofrequency ablation.
Dr. Patsama Vichinsartvichai, MD, MClinEmbryol, EFOG-EBCOG, EFRM-ESHRE/EBCOG, FACOG is a board-certified reproductive endocrinology & infertility specialist, former head of the Vajira IVF unit at Navamindradhiraj University, and founder of LIFE by Dr. Pat in Bangkok. His published research focuses on the dysmorphic (T-shaped) uterus and uterine-factor infertility.
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