Chiari II malformation - subependymal heterotopia - absent septum pellucidum

Case contributed by Ammar Haouimi
Diagnosis almost certain

Presentation

Lumbar myelomeningocele.

Patient Data

Age: 1 year
Gender: Male

The MRI sequences demonstrate:

  • Low lying cerebellar tonsils which are extended 10 mm below the foramen magnum
  • dilated 3rd and lateral ventricles
  • absent septum pellucidum
  • multiple nodules isointense to the cortical grey matter on all sequences are noted along the ventricular margins, bulging into the ventricular lumen in keeping with subependymal grey matter heterotopia

 

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