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OC121: Predicting the level of spina bifida by three‐dimensional ultrasonography—preliminary results

Objective: To evaluate the accuracy of three-dimensional ultrasonography in predicting the level of the defect in spine bifida. Patients and Methods: Between January 2005 and January 2006, the level of spine bifida was evaluated prenatally on three-dimensional ultrasonography (3DUS) using the rendered bone mode. All cases underwent postnatal surgery immediately after birth. Prenatal results obtained on 3DUS were compared to surgical level and to radiological level. Results: Up to now, 21 cases were completely evaluated. The correct surgical level was predicted in 9 (42.86%) cases; difference of one level was observed in 9 (42.86%) fetuses and difference of 2 levels in 3 (14.28%). Up to 1 and to 2 levels of agreement were observed in 18 (85.71%) and 21 (100%) cases. Using the postnatal radiological diagnosis, the correct level was predicted in 9 (42.86%) cases; difference of one level was observed in 9 (42.86%) fetuses and difference of 2 levels in 2 (14.29%). Up to 1 and to 2 levels of agreement were observed in 18 (85.71%) and 21 (100%) cases respectively. Conclusions: In our experience, 3DUS (rendered skeletal mode) is a good method to evaluate the level of spine bifida, with difference of two levels in 14.29% of cases when compared to postnatal surgical and radiological diagnosis.