Fetal anoperineogenital images by ultrasonography--regarding the breech and transverse presentations

Reports seeking the rate of successful echography of the fetal scrotum, penis and labia majora classified by individual weeks of gestation over the long period from the 22nd to the 41st week of gestation, are few. In the present study, the rates of successful echography of the scrotum, penis, labia majora, M-type and F-type of the fetal APG region in the breech and transverse presentations in each week of gestation for the period from the 22nd to the 41st week of gestation were pursued with a view to finding out the best suited time for the observation of each image. Ultrasonography was performed 3039 times in total on 620 pregnant women who delivered their babies, and the following results were obtained: The rates of successful echography classified by presentation decreased in the order of cephalic, breech and transverse presentations. The rates of successful echography with the first and second manipulations classified by individual weeks of gestation were also determined, and the optimal periods for observation were sought. The rates of correct echography as a whole were also determined, with the following results: Breech presentation is 74.1% in male fetuses and 68.3% in female fetuses; Transverse presentation is 66.2% in male fetuses and 58.6% in female fetuses, respectively.