My son has Agenesis of the Corpus Callosum and was also diagnosed with a XYY syndrome . I live in South Africa but at this stage I am in the dark as to what the cause could be as well as what to expect in future. My son is now 2 and a half but still cannot walk or talk. His mother now takes care of him on a permanent basis. I also would like to know whether this could have been detected during pregnancy.
CC agenesis is a wide spectrum disorder with wide variant presentations depending upon its absence or atrophy; I have a vast experience in diagnosing this condition with varying morbidity and in your case, there seems to be an association with chromosomal anomaly. Since the trigger for the formation of CC was not there, there could be associated developmental abnormalities of brain structure which results in delay in development and even seizures. Moreover, you have to get a baseline endocrine work-up as well ophthalmology (vision) consultation because of its close association with mid-line structures. I would recommend for a physio-therapy as well occupational therapy at the earliest for him.