“…Caudal regression syndrome is a rare disorder, with an incidence of about 1–2:100,000 according to some authors, or 1:60,000 live births according to others [ 3 , 6 , 9 , 10 ]. This defect is more common in boys, with an M:F ratio of 2.7:1, but in a recent review of 83 cases, there was no gender predilection [ 3 , 10 ]. The most common CRS defect is sacral agenesis (partial or total), with an incidence of less than 0.5% [ 11 ].…”