Prepubertal gilt (V2/W3). Urine bladder (UB), intestinal loop (IL) and uterus (U).UB (completely anechoic structure) shows a great volume of urine. The gas hyperechogenicity allows distinguishing IL (white line). U appears as a homogeneous and echogenic structure situated between UB and IL. The U height (in blue) is smaller than two-thirds of the total height of the image (in pink); this means that U is not yet fully developed because uterine inactivity, characteristic of a prepubertal gilt