Question:
Identify the condition as shown in the image given below.
Identify the condition as shown in the image given below.
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Widely spaced lateral ventricles resembling a Formula One car from above is the racing car sign.
Updated On: Jun 23, 2026
- Callosal dysgenesis
- Dandy walker syndrome
- Aicardi syndrome
- Septo optic dysplasia
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The Correct Option is A
Solution and Explanation
Step 1: The image shows the classic racing car sign, which is characteristic of callosal dysgenesis (agenesis of the corpus callosum).
Step 2: The racing car sign refers to widely spaced lateral ventricles caused by agenesis of the corpus callosum, with intervening Probst bundles between them.
Step 3: On axial MRI or CT, the appearance resembles a Formula One car seen from above. The tyres are represented by the widely spaced frontal horns, and the dilated trigones (colpocephaly) complete the pattern.
Step 4: Dandy-Walker shows a posterior fossa cyst with vermian hypoplasia, septo-optic dysplasia shows an absent septum pellucidum with optic nerve hypoplasia, and Aicardi has its own triad. None produces the racing car sign, so callosal dysgenesis is correct.
Step 2: The racing car sign refers to widely spaced lateral ventricles caused by agenesis of the corpus callosum, with intervening Probst bundles between them.
Step 3: On axial MRI or CT, the appearance resembles a Formula One car seen from above. The tyres are represented by the widely spaced frontal horns, and the dilated trigones (colpocephaly) complete the pattern.
Step 4: Dandy-Walker shows a posterior fossa cyst with vermian hypoplasia, septo-optic dysplasia shows an absent septum pellucidum with optic nerve hypoplasia, and Aicardi has its own triad. None produces the racing car sign, so callosal dysgenesis is correct.
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