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Several authors have reported the formation of slit valves as the underlying pathomechanism of space-occupying tumor bed cysts. Iatrogenic slit valves following the resection of high-grade gliomas have been linked to certain risk factors such as intraoperative opening of the ventricles and attempts to seal these. The best therapeutic management of such cystic lesions remains elusive. Several treatment options such as cyst fenestration or cystoperitoneal shunting have been employed but remain associated with high rates of recurrence. With the given complications of the above-described treatment options, the objective was to devise a new therapy option that is safe and effective and treats the slit valve itself rather than its symptoms. Methods Between the years of 2010 and 2020, we successfully treated four patients with high-pressure tumor bed cysts following glioma resection by implantation of synthetic ringed vascular grafts into the slit valve. Results Postoperatively, the tumor bed cysts were regressive in all patients. Moreover, none of the treatment patients developed any complications associated with the implanted vascular grafts. Revision-free survival was 10, 12, 53, and 126 months, respectively. Conclusion The use of synthetic vascular grafts as a means of stenting slit valves is a safe and effective novel treatment option for high-pressure tumor bed cysts.

Synthetic vascular grafts as a new treatment option for space-occupying tumor bed cysts