High-resolution uterine cavity assessment that finds what routine scans miss.
✍️ By Dr. Patsama Vichinsartvichai, MD, MClinEmbryol, EFOG-EBCOG, EFRM-ESHRE/EBCOG, FACOG — Reproductive Medicine Specialist · Updated August 2026
Many uterine conditions — septate uterus, T-shaped (dysmorphic) uterus, intracavitary fibroids, polyps, and adhesions — directly affect implantation and pregnancy outcomes. A standard 2D ultrasound shows two planes; 3D adds the coronal view, which is essential to evaluate the cavity shape accurately.
Saline Infusion Sonography (SIS) gently distends the uterine cavity with a small volume of sterile saline through a thin catheter while we scan. The fluid outlines polyps, submucous fibroids, adhesions, and subtle wall irregularities.
SIS is a brief, in-office procedure. Mild cramping is possible but well tolerated by most patients. We discuss every step before starting.
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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