Racing car sign (callosal dysgenesis)

Last revised by Mohamed Saber on 6 Dec 2020

The racing car sign refers to widely spaced lateral ventricles due to agenesis of the corpus callosum with intervening Probst bundles. Appearances on axial MRI or CT are reminiscent of a Formula One car seen from above, with the tyres represented by the widely-spaced frontal horns, and the dilated trigones (colpocephaly).

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