Interhemispheric cyst with corpus callosal dysgenesis

Case contributed by Ashish Mohan Bhattarai
Diagnosis almost certain


History of left-sided focal seizures with multiple episodes of vomiting. No history of fever, neck rigidity, or trauma.

Patient Data

Age: 5 years
Gender: Male

There is a grey matter-lined CSF cleft (maximum thickness 4 cm) extending from the right parasagittal frontal cortex and communicating with the frontal horn and body of the right lateral ventricle. The bodies of the bilateral lateral ventricles are widely placed, with absence of the genu, rostrum, and body of the corpus callosum; however, the splenium of the corpus callosum is present.

Case Discussion

The findings are consistent with an interhemispheric cyst associated with dysgenesis of the corpus callosum. These associations are rare but well-recognized entities.

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