Between 2004 and 2013 an isolated ACC (either partial or complete) was diagnosed in 60 women referred to a regional prenatal diagnosis center. Inclusion criteria were: no other malformation on ultrasound (22 weeks) and MRI (28 weeks), no consanguinity, no familial history of developmental delay, no genetic defect on fetal karyotype or Array CGH. All patients were assessed with standardized batteries: Brunet Lézine before 3 years old, WPPSI-III at 3 and 5 years old, WISC-IV at 8 years old.
Among 60 pregnancies, 12 abortions, one fetal death, one lost outcome, and 46 newborn (76% of the pregnancies). Among the sixteen younger children (<3 y old), one had a severe developmental delay, the others had normal developmental skills. Among the thirty older children (3 to 10 years old), one had a severe intellectual disability (Mowat-Wilson syndrome), nine (30%) had specific learning disabilities (with IQ >70), and 20 (66%) had normal IQ and learning skills.
A rare risk of a severe cognitive impairment (2/46 patients; 4.3%) cannot be excluded and must be shared with the women. Nevertheless, 30% of patients had specific learning disabilities and two thirds had a normal outcome, which is consistent with other small series of isolated ACC