Callosal dysgenesis with interhemispheric cyst
New onset seizures.
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There is severe callosal dysgenesis, with colpocephalic orientation of the lateral ventricles and absence of the septum pellucidum. Only a small segment of the callosal genu is present. Anterior and posterior commissures are present. The falx is intact. A large left paramedian cyst is in direct communication with the frontal horn of the lateral ventricle. The adjacent frontal lobe is displaced laterally, but is otherwise intact (i.e. there is no gliosis or evidence of porencephaly).
No further associations of callosal dysgenesis are present - in particular, no midline lipoma, no schizencephaly, and the pituitary gland and infundibulum are present.
Features of callosal dysgenesis with interhemispheric cyst (Barkovich type 1a) as a first diagnosis in a young adult patient.