Partial Agenesis of the Corpus Callosum

Associated Brain Abnormalities

Microcephaly with simplified gyral patterns is a common associated brain abnormality in patients with partial corpus callosum agenesis, according to the Brain journal 1
Lissencephaly, characterized by a smooth brain with absent or reduced gyration and thickened cortex, is another associated brain abnormality, as reported in the Brain journal 1, 3
Polymicrogyria, excessive small gyri, is also associated with partial corpus callosum agenesis, as noted in the Brain journal 1
Grey matter heterotopia, including subcortical, transmantle, and ribbon-like patterns, is an associated brain abnormality, as described in the Brain journal 3, 4, 5
Interhemispheric cysts may accompany the malformation, as reported in the Brain journal 4
Vermis hypoplasia, underdevelopment of the cerebellar vermis, is an associated brain abnormality, as noted in Praxis Medical Insights 2

The American Academy of Pediatrics recommends obtaining brain MRI with diffusion-weighted imaging to characterize the specific pattern and identify associated malformations, as suggested in Praxis Medical Insights 2
Morphometric analysis should be performed to distinguish true hypoplasia from normal variation, as recommended in Praxis Medical Insights 2
Genetic testing with chromosomal microarray as first-line, followed by whole exome sequencing if initial testing is negative and clinical suspicion remains high, is recommended in Praxis Medical Insights 2
If lissencephaly is present, testing for chromosome 17p13.3 microdeletion (LIS1 locus) should be prioritized, as suggested in Praxis Medical Insights 2

Comprehensive multidisciplinary care coordination should be established, including a medical home to coordinate preventive care, immunizations, and acute illness management, as recommended in Praxis Medical Insights 2
Baseline developmental evaluation should be performed in all children with partial corpus callosum agenesis, regardless of whether additional anomalies are present, with reassessment at regular intervals to detect emerging delays, as suggested in Praxis Medical Insights 2
Early intervention services should be initiated immediately upon identification of any developmental delays, as recommended in Praxis Medical Insights 2
Developmental surveillance and screening using standardized tools at regular intervals should be implemented, as suggested in Praxis Medical Insights 2, 6

Cardiology evaluation before any surgical intervention is essential, particularly in patients with suspected genetic syndromes associated with congenital heart disease, as recommended in Praxis Medical Insights 2
Ophthalmologic evaluation for ptosis, amblyopia, refractive errors, and strabismus should be performed, as suggested in Praxis Medical Insights 2
Audiologic assessment for sensorineural hearing loss, which occurs in up to 40% of syndromic cases, should be conducted, as recommended in Praxis Medical Insights 2
Renal ultrasound to screen for structural anomalies in syndromic presentations should be performed, as suggested in Praxis Medical Insights 2