[Corpus callosum agenesia combined with a cyst in the pellucid septum (author's transl)].

In two blood-related Libyan siblings aged 3 and 6 years with psychomotor retardation, attacks, hyperkinetic behaviour and lack of co-ordination of differentiated motor functions, CT scanning revealed a cyst in the pellucid septum and Verga's ventricle, combined with deficient corpus callosum, hydrocephalus and microcephalia.