Early detection of caudal regression syndrome: specific interest and findings in three cases.

Caudal regression syndrome (CRS) is a rare malformative syndrome seen mainly in cases of maternal diabetes with poor metabolic control. Early detection by vaginal ultrasound is possible. The authors describe three cases of CRS, relating the characteristic ultrasound findings which include abrupt interruption of the spine at the dorsal or lumbar level and abnormal position of the lower limbs. The femur bones are fixed in a 'V' pattern, giving a typical 'Buddha's poise'.