Dysgenesis of the corpus callosum

Case contributed by Ammar Haouimi
Diagnosis almost certain

Presentation

Congenital cerebral anomaly discovered on CT (not shown) done for nasal obstruction.

Patient Data

Age: 20 years
Gender: Male
This study is a stack
Sagittal
T1
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Axial
FLAIR
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Coronal
T2
This study is a stack
Axial T2
fat sat
This study is a stack
Coronal T2
fat sat
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Info

The MRI demonstrates:

  • dysgenesis of the corpus callosum:
    • hypoplasia of the anterior body with agenesis of the genu, rostrum, posterior body, isthmus, and splenium ​
    • parallel lateral ventricles "racing car sign" and dilatation of the occipital horns (colpocephaly)
    • narrow frontal horns, high-riding 3rd ventricle, giving a "moose head appearance" on coronal T2
    • sunray appearance of the gyri on sagittal T1 sequence
    • widened mid-portion of the interhemispheric fissure​
    • absence of the cingulate sulcus
  • extensive soft tissue opacification of the nasal cavities and paranasal sinuses in keeping with sinonasal polyposis

Case Discussion

MRI features of dysgenesis of the corpus callosum (incidental finding) in a patient with sinonasal polyposis.

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