Fig. 2

Penile corporeal dysgenesis in the so-called Y-type urethral duplication compared to normal control. Upper row (a, b, and c): Pelvic MRI (sagittal, coronal, and axial, respectively) of a 24-month-old boy (control) demonstrating normal anatomy: two dorsal corpora cavernosa (yellow arrows) and ventral corpus spongiosum (white arrow). Lower row (d, e, and f): Pelvic MRI (sagittal, coronal, and axial, respectively) of a 5-month-old boy with accessory urethro-anal tract. Note that the three corporeal bodies in the control (upper row) are replaced by a single corporeal body (single black arrow) in the case with accessory urethro-anal tract (lower row). UB, urinary bladder; P, pubic symphysis; i, ischial tuberosity