Gamma Knife Radiosurgery for Third Ventricular Colloid Cysts: A Retrospective Study

Author:

El-Shehaby Amr M.N.,Reda Wael A.,Abdel Karim Khaled M.,Nabeel Ahmed M.,Emad Eldin Reem M.,Tawadros Sameh R.

Abstract

<b><i>Introduction:</i></b> Colloid cysts often occur in the third ventricle, and they are considered benign, slowly growing lesions. They commonly present with symptoms of intracranial hypertension and rarely sudden death due to acute hydrocephalus. The management options include cerebrospinal fluid diversion procedure by shunt, endoscopic or transcranial surgical excision, and stereotactic aspiration. Complications associated with excisional procedures make them undesirable to some patients. Stereotactic radiosurgery has emerged as a noninvasive less risky treatment option. To date, there is no clinical series in the literature reporting on this treatment modality. The aim of the study was to determine the efficacy and safety of gamma knife (GK) radiosurgery in the treatment of third ventricular colloid cysts. <b><i>Methods:</i></b> This is a retrospective study involving 13 patients with third ventricular colloid cysts who underwent GK radiosurgery. GK radiosurgery was used as a primary treatment in all the patients. The median prescription dose was 12 Gy (11–12 Gy). The cyst volumes ranged from 0.2 to 10 cc (median 1.6 cc). <b><i>Results:</i></b> The median follow-up was 50 months (18–108 months). Cyst control was achieved in 100% of the patients. Complete or partial response was observed in 12 patients (92%). Eight patients (62%) had hydrocephalus on imaging at the initial diagnosis. Seven of these patients had VP shunt insertion before GK. One patient required shunt insertion after GK. <b><i>Conclusion:</i></b> GK for third ventricular colloid cysts is a promising treatment, regarding its efficacy and safety, to be added to other treatment options. A longer follow-up is required to confirm long-term control.

Publisher

S. Karger AG

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