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https://www.selleckchem.com/products/plx51107.html © 2020 Old City Publishing, Inc.Purpose/Objectives The Gamma-Knife radiosurgery (GKRS) (Elekta AB, Stockholm) platform delivers highly conformal and precise radiation; however, intracranial displacement during treatment allows for the potential of a marginal target-miss. Frameless (mask-based) GKRS using the Gamma Knife Icon system monitors nasal tip motion as a surrogate for intracranial motion by tracking an infrared marker using a high-definition motion management (HDMM) system. To date, there is limited data available regarding the incidence and severity of motion and factors that impact intrafraction motion when treating with frameless GKRS. Materials/Methods A retrospective study was performed to evaluate patients with brain tumors who were treated with frameless GKRS using the Gamma Knife Icon between May and December 2018. All patients underwent mask-based immobilization using a thermoplastic mask. Data on patient demographics, mask type, use of bite block, and number of treatments received, use of anxiolytics, treatment time, and wction motion during GKRS with mask-based immobilization through HDMM tracking. Increased intracranial displacement during frameless GKRS was associated with higher ECOG, male gender, increased treatment time and malignant tumors, while anxiolytics were shown to mitigate excessive motion. Radiosurgery teams should consider these patient factors when treating patients with mask immobilization. © 2020 Old City Publishing, Inc.Background Cerebral arteriovenous malformations or angiomas are congenital vascular anomalies defined by abnormal arteriovenous shunt. Materials and methods We conducted a retrospective study between January 1992 and December 2010 at the Timone Hospital radiosurgery unit, 1557 patients were treated by radiosurgery for arteriovenous malformation of which 53 for thalamic localization (3,4%). Results The mean age was 35.8-/+16.6 years (4-75). 14 patients underwent

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