Sonographic imaging and differential diagnosis of fetal perineal masses.

This case series describes our experience with a prenatal diagnosis of fetal perineal masses. We propose a clinical-sonographic approach for prenatal workup in cases presenting perineal findings based on imaging the target sign at the posterior perineal triangle, the fetal genitalia, and sacrum. Targeted, structured prenatal anatomical scan in fetuses presenting with perineal masses may aid in the prenatal differential diagnosis and enable appropriate genetic analysis, prenatal counseling, and postnatal treatment.