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Anatomy
A 5-day-old male infant is diagnosed with anorectal agenesis. An ultrasound study reveals a rectourethral fistula. Which of the following is the most likely embryologic cause of this condition?
Failure of the proctodeum to develop
Agenesis of the urorectal septum
Failure of fixation of the hindgut
Abnormal partitioning of the cloaca
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