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The Prader scale/staging depicts different degrees of virilization of the genitalia. Stage 0 indicates female; stage VI indicates male; the in-between stages I–V represent a variable spectrum of virilization. Notable virilization changes include clitoris transforming to meatus, labia minora transforming to phallus, labia majora transforming to scrotum, vagina merging into urogenital sinus and perineal orifices migrating through hypospadias position to distal meatus. The uterus and upper vagina (Müllerian structures) are illustrated with a dashed line in stages I–V, indicating that they are variably present in stages I–V. The virilized stages are shown as circumcised; foreskin is not depicted to clearly demonstrate transition from clitoris to meatus

The Prader scale/staging depicts different degrees of virilization of the genitalia. Stage 0 indicates female; stage VI indicates male; the in-between stages I–V represent a variable spectrum of virilization. Notable virilization changes include clitoris transforming to meatus, labia minora transforming to phallus, labia majora transforming to scrotum, vagina merging into urogenital sinus and perineal orifices migrating through hypospadias position to distal meatus. The uterus and upper vagina (Müllerian structures) are illustrated with a dashed line in stages I–V, indicating that they are variably present in stages I–V. The virilized stages are shown as circumcised; foreskin is not depicted to clearly demonstrate transition from clitoris to meatus

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When infants are identified with a difference of sex development (DSD), a thoughtful approach to imaging is essential to appropriate clinical management. This review provides a comprehensive guide for radiologists who are tasked with performing this critical assignment. We review the embryologic basis of DSDs, with attention to the imaging findings...

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