Fetal perineal sonography in the diagnosis of ectopic ureteric opening.

We describe the technique of fetal perineal sonography and its use in the diagnosis of ectopic ureteric opening. Using a high-frequency probe, sagittal ultrasound imaging of the fetal perineum, pelvis and external genitalia was performed and proved useful in the diagnosis of ectopic ureteric opening into the urethra in one female and two male fetuses.