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Classifications of callosal anomalies. Group 1, isolated agenesis/hypoplasia of the corpus callosum; group 2, agenesis/hypoplasia of the corpus callosum in association with other CNS abnormalities; group 3, agenesis/hypoplasia of the corpus callosum in association with both CNS and non-CNS abnormalities; and group 4, agenesis/hypoplasia of the corpus callosum in association with non-CNS abnormalities. CNS: central nervous system.
