Suprasellar arachnoid cyst after subdural haemorrhage in an infant. A case based update.

INTRODUCTION

Brain arachnoid cysts (AC) are congenital or acquired malformations. Their prevalence in children ranges between 0.2 and 2.3% of the studied populations. Few reported studies exist where AC appears after a subdural haemorrhage.

METHODS

We present one case of a symptomatic suprasellar AC after post-traumatic subdural haemorrhage in an infant.

RESULTS

After endoscopic ventriculocystostomy, the child quickly improved and the cyst reduced in size. The child was monitored for 22 months and his neurocognitive development remained normal.

CONCLUSION

Our case led us to the hypothesis that the inflammatory process due to subdural haemorrhage may locally result in arachnoiditis, and thus to the creation of a neomembrane, and eventually to cyst formation. This is also the case with the development of post-traumatic spinal AC.