Presentation
21w3d GA. Morphology ultrasound
Neurosonography demonstrates non-visualization of the corpus callosum, dorsal expansion of the 3rd ventricle forming a small interhemispheric cyst, a widened interhemispheric fissure, and colpocephaly with mild dilation of both ventricles (right: 10.5mm left : 11.4mm). Abnormal configuration of pericallosal artery further supports the diagnosis.
The lateral ventricles demonstrate posterior colpocephaly and parallel configuration in keeping with callosal dysgenesis.
Left lateral ventricle measures 11.5 mm and right 9.6 mm. The third ventricle is high riding measuring 2 mm in diameter. The fourth ventricle measures 3 mm in AP diameter.
The corpus callosum appears completely absent with no crossing fibers identified.
Case Discussion
Ultrasound and MRI features of complete callosal agenesis. Note additional finding of a cortical migrational anomaly involving the right cerebral hemisphere on MRI. This is a significant finding in terms of neurodevelopmental prognosis.
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