Agenesis of corpus callosum is the cerebral malformations whose prognosis is uncertain. But the complete agenesis shows more poor prognosis than partial agenesis. So, the type of agenesis can affect significantly the antepartum management. Recently, there has been a development in diagnostic tools like MRI to overcome these limitations of antenatal ultrasonography. We report a case of agenesis of corpus callosum which was diagnosed by prenatal MRI. This case was confused with Dandy-Walker complex in prenatal ultrasonography and supported in diagnosis by prental MRI.