P03.11: Ultrasonographic features of trisomy 13

as being normal (n = 22) or abnormal (n = 26) and whether the diagnosis was made correctly. Results: For the discernment between normal and abnormal the sensitivity is higher for VE (86.2% vs. 81.5% P = 0.24) and the specificity is higher for 2D/3D US (83.6% vs. 73.6% P = 0.05). VE has a higher sensitivity (63.3% vs. 53.1% P = 0.07) when analyzing the correctness of a diagnosis, whereas specificity is comparable. Malformations of the face, skeleton and extremities are more often correctly diagnosed with VE. The reviewers preferred VE above 2D/3D US. More time was required for evaluation with VE as compared to 2D/3D. Conclusions: The detection rate for first trimester abnormalities is higher for VE and more diagnostic information became available with VE. VE has additional value in first trimester diagnosis of malformations of the face and limbs/skeleton.