Corpus callosal lipoma - tubulonodular variety

Case contributed by Paresh K Desai
Diagnosis certain



Patient Data

Age: 9 years
Gender: Male

Note: This case has been tagged as "legacy" as it no longer meets image preparation and/or other case publication guidelines.

Axial post contrast CT demonstrates a fat density mass located in the interhemispheric fissure, bounded laterally by curvilinear calcifications (known as the bracket sign), best seen on the coronal reconstruction (unfortunately relatively coarse due to thick axial acquisition).

The ventricles are widely spaced with colpocephaly (racing car sign) in keeping with corpus callosal dysgenesis. 

Selected images from an MRI of the brain demonstrate dysgenesis of the corpus callosum with an inter-hemispheric fatty mass entering the lateral ventricles which have a viking helmet or moose head configuration. The anterior cerebral artery and branches can be seen coursing through the superior aspect of the mass. 

Annotated images

Annotated image

This case demonstrates both a bracket sign (curvilinear calcification on either side of the mass) an the moose head sign (also known as viking helmet sign) with fatty tissue herniating into the lateral ventricles. 

Case Discussion

This case demonstrates corpus callosal dysgenesis associated with a pericallosal lipoma (tubulonodular type). 

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