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Fig. 1B. —35-gestational-week-old fetus with suspected renal agenesis, which occurs if metanephric diverticulum fails to develop or to penetrate metanephric blastema. Axial MRI of fetal abdomen reveals large anterior mass thought to represent single abnormal lower extremity (large straight arrow), but no kidneys, on either side of spinal column (small straight arrow). Placenta (curved arrows) abuts fetus because of anhydramnios.