A fetal interhemispheric cyst refers to an interhemispheric cyst diagnosed in utero. It is seen as a cystic collection located in the interhemispheric fissure, with or without communication with the ventricular system.
- agenesis of the corpus callosum: strong association
- midline fetal arachnoid cyst: no associated agenesis of the corpus callosum
- cyst-like lesions related to physiologic median structures
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