Endoscopic treatment of suprasellar and third ventricle-related arachnoid cysts

Objective: To evaluate the role of neuroendoscopy in the treatment of rare suprasellar and other third ventricle -related arachnoid cysts. Methods: A review of supratentorial midline arachnoid cysts treated by endoscopic fenestration. Results: Ten cases were identified. The median age of these ten patients was 7.5 years. In three a cysto- or ventriculoperitoneal shunt had previously been inserted. Six cysts were located in the suprasellar/prepontine area, one was a combined suprasellar/middle fossa cyst, and three were complex cysts arising mainly in the quadrigeminal cistern and extending into the third ventricle. Successful endoscopic fenestration to both the ventricular system and the basal cisterns ("bipolar" fenestration) was achieved in all cases. In seven cases a cystoventriculostomy and cystocisternostomy was performed, while in three a cystoventriculostomy was combined with a third ventriculostomy, achieving additional communication to the subarachnoid space. The previously inserted shunts were removed at the end of the procedure. The median follow-up period was 17 (range 1-30) months. The clinical outcome was excellent in all cases, despite only marginal reduction in the cyst size and persistence of ventriculomegaly in some cases. No further treatment to the cyst was required during the period of follow-up. Conclusion: Third ventricle-related arachnoid cysts can be satisfactorily and safely treated by endoscopy. This approach leaves the patient shunt independent.