<prompt> Racing car sign is seen inLipoma of corpus callosumAgenesis of corpus callosumNecrosis of corpus callosumDegeneration of corpus callosum  <response>: Racing car signMoose head signViking Helmet Sign is seen in Agenesis of Corpus Callosum on MRI. Probst bundles denote white matter fibers normally destined to cross the corpus callosum that instead parallel the interhemispheric fissure in patients with agenesis of corpus callosum. These lead to widely spaced lateral ventricles forming the characteristic racing car sign. High riding 3rd ventricle is also seen in CC agenesis. 