OC29.02: How to diagnose a t-shaped uterus by 3D-TVS criteria: a comparative study Consecutive fertile patients with t-shaped and septate uterus were recruited and compared to a control group (normal uterus). The lateral uterine wall thickness > 17mm and the lateral/anteroposterior uterine wall thickness ratio > 1.4 should be considered proper criteria to diagnose a t-shaped uterus.