Premise: This abnormal development of the brain occurs during pregnancy, and can actually be seen on an intrauterine MRI by 20 to 24 weeks gestation. Lissencephaly may occur alone or as part of conditions such as Miller-Dieker syndrome, Norman-Roberts syndrome, or Walker-Warburg syndrome. The condition is considered uncommon, occurring in roughly one out of 100,000 babies
Statement: The condition is considered rare, occurring in roughly one out of 100,000 babies
Relationship: entailment