Contribution of neuroendoscpy in the non tumoral stenosis of the foramen of monro: Two case reports and literature review.

Abstract

Introduction
Non-tumoral stenosis of the foramen of Monro is a rare anatomoclinical entity which causes asymmetric hydrocephalus of the lateral ventricles when the stenosis concerns a single foramen or biventricular dilation when it is bilateral. The objective of this work is to report the efficacy of neuroendoscopic surgery in the treatment of this pathology.
Method
We report two observations of non-tumoral stenosis of Monro‘s foramen. Both patients underwent endoscopic treatment with a foraminoplasty completed by endoscopic third ventriculostomy. The postoperative follow-up was straightforward with clinical improvement.
Discussion
Monro‘s foramen stenosis is a rare condition. Its pathogenic mechanism is poorly understood. Cerebral MRI can be used to diagnose and rule out a tumor origin of the stenosis. Cerebral endoscopy allows better visualization of the stenosis as well as the associated intraventricular malformations. It also allows for the performance of foraminoplasty with endoscopic third ventriculostomy.
Conclusion
Non-tumoral stenosis of the foramen of monro is an uncommon condition. The clinical expression is that of intracranial hypertension. Its diagnosis is suggested on cerebral MRI. Intraventricular endoscopy confirms the non-tumoral etiology of the stenosis and allows treatment of hydrocephalus by reestablishing the CSF outflow pathways.