Intraventricular arachnoid cyst

Abstract

Two patients with intraventricular arachnoid cysts are reported and a brief review of the relevant literature is presented. Arachnoid cysts are usually extracerebral or extraventricular. Intraventricular arachnoid cysts are rare: including the two cases reported here, only five cases have been described. The following characteristics were noted in these five patients: all were young; headache was the initial symptom in four; the cyst was in the trigone of a lateral ventricle in four; and there was dilatation of the inferior horn in three.

A large arachnoid cyst of the lateral ventricle extending from the supracerebellar cistern—case report

“…The above case showed compression and displacement of the choroid plexus of the dilated lateral ventricle that suggests that the arachnoid cyst extended from the other subdural space. We conclusively suggest that this arachnoid cyst extended from the supracerebellar space and support the extension hypothesis of Nakase et al [11].…”

“…If the authors' case is included, the combined approach totals 5 cases [2,6,8,12,24]. In the literature that describes 15 adult arachnoid cysts of the lateral ventricle, the patients were treated with open cyst removal in 2 cases, open fenestration or partial cyst removal in 7 cases, endoscopic fenestration in 2 cases, fenestration and shunt in 2 cases, and no treatment in 2 cases [3,5,7,9,11,13,17,[21][22][23]. From this study, the authors suggest that endoscopic fenestration of an extremely large intraventricular arachnoid cyst with high pressure could result in rare post-decompression subdural fluid collection.…”

“…Developmental mechanisms of intraventricular arachnoid cysts are also as yet unknown, but Yeates and Enzmann [23] have suggested that intraventricular arachnoid cyst may originate from the vascular mesenchyme because they were able to observe an intraventricular arachnoid cyst attached to the choroid plexus with pathological mesenchymal components of the choroid plexus present in the wall of the arachnoid cyst. Nakase et al [11] reported two intraventricular arachnoid cysts and suggested that intraventricular arachnoid cyst may have extended from the arachnoid cyst in the subarachnoid space into the lateral ventricle through the choroidal fissure. However, there has been no confirmative case in the literature that describes Fig.…”

“…The precise pathogenetic mechanisms involved in the formation of intraventricular arachnoid cysts are as yet unknown. Yeates and Enzmann [23] have suggested that intraventricular arachnoid cyst may originate from the vascular mesenchyme of the choroids plexus, whereas Nakase et al [11] postulated that the intraventricular arachnoid cyst may be an extension of the arachnoid cyst in the subarachnoid space into the lateral ventricle through the choroidal fissure. However, there has been no such reported confirmative case in the literature that has demonstrated definite extension of an arachnoid cyst from the subarachnoid space into the lateral ventricle through the choroidal fissure.…”

Transoccipital endoscopic fenestration of atrial cysts causing ventricular entrapment

“…Fluid diversion from the entrapped ventricular segments or from the cyst itself was often attempted in the past, but such shunts are prone to failure. 12,[16][17][18]28,29 Alternatively, microsurgical and frame-based stereotactic surgeries have also been reported in the treatment of intraventricular cysts with variable rates of success. 1,3,7,14,17,18,20,22,25 More recent reports of endoscopic or endoscopically assisted surgeries have shown promising results for treating intraventricular lesions.…”