scholarly journals Mean Brain Dose Remains Uninfluenced by Lesion Number for Gamma Knife Stereotactic Radiosurgery for Ten+ Metastases

2021 ◽  
Author(s):  
Sean Sachdev ◽  
Timothy L. Sita ◽  
Mahesh Gopalakrishnan ◽  
Michael K. Rooney ◽  
Alexander Ho ◽  
...  
Keyword(s):  
Stereotactic Radiosurgery ◽  
Gamma Knife ◽  
Chart Review ◽  
Tumor Volume ◽  
Median Number ◽  
Single Institution ◽  
Whole Brain ◽  
Lesion Number ◽  
The Mean ◽  
Gamma Knife Stereotactic Radiosurgery

Abstract Purpose:Gamma Knife (GK) stereotactic radiosurgery (SRS) is increasingly used as an initial treatment for patients with ten or more brain metastases (BM). However, the clinical and dosimetric consequences of this practice are not well established.Methods: We performed a single institution, retrospective analysis of 30 patients who received GK SRS for ten or more BM in one session. We utilized MIM Software to contour the whole brain and accumulated the doses from all treated lesions to determine the mean dose delivered to the whole brain. Patient outcomes were determined from chart review. Results: Our cohort had a median number of 13 treated lesions (range 10 to 26 lesions) for a total of 427 treated lesions. The mean dose to the whole brain was determined to be 1.8 ± 0.91 Gy (range 0.70 to 3.8 Gy). Mean dose to the whole brain did not correlate with the number of treated lesions (Pearson r=0.23, p=0.21), but was closely associated with tumor volume (Pearson r=0.95, p<0.0001). There were no significant correlations between overall survival and number of lesions or aggregate tumor volume. Fourteen patients (47%) underwent additional SRS sessions and six patients (20%) underwent WBRT a median of 6.6 months (range 3.0-50 months) after SRS. Two patients (6.6%) developed grade 2 radionecrosis following SRS beyond earlier WBRT.Conclusion: The mean dose to the whole brain in patients treated with GK SRS for 10 or more BM remained low with an acceptable rate of radionecrosis. This strategy allowed the majority of patients to avoid subsequent WBRT.

scholarly journals Clinical dose profile of Gamma Knife stereotactic radiosurgery for extensive brain metastases

2020 ◽  
pp. 1-5
Author(s):  
Gregory Neil Bowden ◽  
Jong Oh Kim ◽  
Andrew Faramand ◽  
Kevin Fallon ◽  
John Flickinger ◽  
...  
Keyword(s):  
Brain Metastases ◽  
Stereotactic Radiosurgery ◽  
Gamma Knife ◽  
Tumor Volume ◽  
Median Number ◽  
Whole Brain Radiation ◽  
Clinical Scenarios ◽  
The Mean ◽  
Gamma Knife Stereotactic Radiosurgery ◽  
The Brain

OBJECTIVEThe use of Gamma Knife stereotactic radiosurgery (GKSRS) for the treatment of extensive intracranial metastases has been expanding due to its superior dosimetry and efficacy. However, there remains a dearth of data regarding the dose parameters in actual clinical scenarios. The authors endeavored to calculate the radiation dose to the brain when treating ≥ 15 brain metastases with GKSRS.METHODSThis retrospective analysis reviewed dosage characteristics for patients requiring single-session GKSRS for the treatment of ≥ 15 brain metastases. Forty-two patients met the inclusion criteria between 2008 and 2017. The median number of tumors at the initial GKSRS procedure was 20 (range 15–39 tumors), accounting for 865 tumors in this study. The median aggregate tumor volume was 3.1 cm3 (range 0.13–13.26 cm3), and the median marginal dose was 16 Gy (range 14–19 Gy).RESULTSThe median of the mean brain dose was 2.58 Gy (range 0.95–3.67 Gy), and 79% of patients had a dose < 3 Gy. The 12-Gy dose volume was a median of 12.45 cm3, which was equivalent to 0.9% of the brain volume. The median percentages of brain receiving 5 Gy and 3 Gy were 6.7% and 20.4%, respectively. There was no correlation between the number of metastases and the mean dose to the brain (p = 0.8). A greater tumor volume was significantly associated with an increased mean brain dose (p < 0.001). The median of the mean dose to the bilateral hippocampi was 2.3 Gy. Sixteen patients had supplementary GKSRS, resulting in an additional mean dose of 1.4 Gy (range 0.2–3.8 Gy) to the brain.CONCLUSIONSGKSRS is a viable means of managing extensive brain metastases. This procedure provides a relatively low dose of radiation to the brain, especially when compared with traditional whole-brain radiation protocols.

scholarly journals 16. GAMMA KNIFE CLINICAL DOSE PROFILE FOR EXTENSIVE BRAIN METASTASES

2020 ◽  
Vol 2 (Supplement_2) ◽  
pp. ii2-ii2
Author(s):  
Greg Bowden ◽  
Jong Kim ◽  
Andrew Faramand ◽  
Kevin Fallon ◽  
John Flickinger ◽  
...  
Keyword(s):  
Brain Metastases ◽  
Gamma Knife ◽  
Tumor Volume ◽  
Median Number ◽  
Median Percentage ◽  
Whole Brain Radiation ◽  
Clinical Scenarios ◽  
The Mean ◽  
Gamma Knife Stereotactic Radiosurgery ◽  
The Brain

Abstract BACKGROUND The use of Gamma Knife stereotactic radiosurgery (GKSRS) for the treatment of extensive intracranial metastases has been expanding due to its superior dosimetry and efficacy. However, there remains a dearth of data regarding the dose parameters in actual clinical scenarios. We endeavored to calculate the radiation dose to the brain when treating &gt;15 brain metastases with GKSRS. METHODS This retrospective analysis reviewed dosage characteristics for patients requiring single session GKSRS for the treatment of 315 brain metastases. Forty-two patients met the inclusion criteria between 2008 and 2017. The median number of tumors at the initial GKSRS procedure was 20 (15–39) which accounted for 865 tumors in this study. The median aggregate tumor volume was 3.1cm3(0.13–13.26) and the median marginal dose was 16Gy (14-19Gy). RESULTS The median of the mean brain dose was 2.58Gy (range 0.95–3.67Gy) and 79% of patients had a dose &lt;3Gy. The 12Gy dose volume was a median of 12.45cm3, which was equivalent to 0.9% of the brain volume. The median percentage of brain receiving 5Gy and 3Gy was 6.7% and 20.4%, respectively. There was no correlation between the number of metastases and the mean dose to the brain (p=0.8). A higher tumor volume was significantly associated with an increased mean brain dose (p&lt;0.001). The median of the mean dose to the bilateral hippocampi was 2.3Gy. Sixteen patients had supplementary GKSRS, resulting in an additional mean dose of 1.4Gy (0.2–3.8Gy) to the brain. CONCLUSION GKSRS is a viable means of managing extensive brain metastases. This procedure provides a relatively low dose of radiation to the brain, especially when compared to traditional whole brain radiation protocols.

Tumor volume threshold for achieving improved conformity in VMAT and Gamma Knife stereotactic radiosurgery for vestibular schwannoma

2015 ◽  
Vol 115 (2) ◽  
pp. 229-234 ◽  
Author(s):  
Hyun Kim ◽  
Peter Potrebko ◽  
Amanda Rivera ◽  
Haisong Liu ◽  
Harriet B. Eldredge-Hindy ◽  
...  
Keyword(s):  
Stereotactic Radiosurgery ◽  
Gamma Knife ◽  
Vestibular Schwannoma ◽  
Tumor Volume ◽  
Gamma Knife Stereotactic Radiosurgery

Gamma Knife Stereotactic Radiosurgery for Brain Metastases Using Only 3 Pins

Neurosurgery ◽  
2016 ◽  
Vol 78 (6) ◽  
pp. 877-882 ◽  
Author(s):  
Jennifer C. Ho ◽  
Dershan Luo ◽  
Nandita Guha-Thakurta ◽  
Sherise D. Ferguson ◽  
Amol J. Ghia ◽  
...  
Keyword(s):  
Brain Metastases ◽  
Stereotactic Radiosurgery ◽  
Gamma Knife ◽  
Local Control ◽  
Internal Control ◽  
Occipital Lobe ◽  
Median Number ◽  
Posterior Lesion ◽  
Control Lesion ◽  
Gamma Knife Stereotactic Radiosurgery

Abstract BACKGROUND: Removal of a pin during Gamma Knife stereotactic radiosurgery (GK-SRS) may be necessary to prevent collision and allow treatment. OBJECTIVE: To investigate outcomes after GK-SRS for treatment of brain metastases using a head frame immobilized to the skull with only 3 pins. METHODS: Between 2009 and 2014, we retrospectively reviewed the records of 1971 patients and identified 20 patients with multiple brain metastases treated with GK-SRS in which 1 anterior pin was removed immediately before treatment of a single posterior lesion. GK-SRS was also delivered to 116 other lesions in these 20 patients using the standard 4 pins during the same session, serving as an internal control for comparison. Endpoints included local control, dosimetric parameters, toxicity, and overall survival. RESULTS: The median number of lesions treated per session was 6 (range, 2-14). The lesions treated using 3 pins were located in the occipital lobe (n = 14) or the cerebellum (n = 6). Median follow-up was 12.3 months. There was 1 local failure involving a control lesion. Lesions treated using 3 pins had a lower prescription isodose line. GK-SRS of a lesion using 3 pins did not cause any clinical toxicities or increase in radiographic edema or hemorrhage. CONCLUSION: Treating posteriorly located brain metastases with GK-SRS using only 3 pins provided excellent local control and no difference in treatment toxicity, which may make it a safe and reasonable option for lesions that may otherwise be difficult to treat.

Stereotactic drainage and Gamma Knife radiosurgery of cystic brain metastasis

2008 ◽  
Vol 109 (2) ◽  
pp. 259-267 ◽  
Author(s):  
Alberto Franzin ◽  
Alberto Vimercati ◽  
Piero Picozzi ◽  
Carlo Serra ◽  
Silvia Snider ◽  
...  
Keyword(s):  
Radiation Therapy ◽  
Brain Metastasis ◽  
Confidence Interval ◽  
Gamma Knife ◽  
Tumor Volume ◽  
Whole Brain Radiation Therapy ◽  
Whole Brain ◽  
Whole Brain Radiation ◽  
The Mean ◽  
Brain Radiation

Object Treatment options for patients with brain metastasis include tumor resection, whole-brain radiation therapy, and radiosurgery. A single treatment is not useful in cases of multiple tumors, of which at least 1 is a cystic tumor. The purpose of this study was to assess the role of stereotactic drainage and Gamma Knife surgery (GKS) in the treatment of cystic brain metastasis. Methods Between January 2001 and November 2005, 680 consecutive patients with brain metastases underwent GKS at our hospital, 30 of whom were included in this study (18 males and 12 females, mean age 60.6 ± 11 years, range 38–75 years). Inclusion criteria were: 1) no prior whole-brain radiation therapy or resection procedure; 2) a maximum of 4 lesions on preoperative MR imaging; 3) at least 1 cystic lesion; 4) a Karnofsky Performance Scale score ≥ 70; and 5) histological diagnosis of a malignant tumor. Results Non–small cell lung carcinoma was the primary cancer in most patients (19 patients [63.3%]). A single metastasis was present in 13 patients (43.3%). There was a total of 81 tumors, 33 of which were cystic. Ten patients (33.3%) were in recursive partitioning analysis Class I, and 20 (66.6%) were in Class II. Before drainage the mean tumor volume was 21.8 ml (range 3.8–68 ml); before GKS the mean tumor volume was 10.1 ml (range 1.2–32 ml). The mean prescription dose to the tumor margin was 19.5 Gy (range 12–25 Gy). Overall median patient survival was 15 months. The 1- and 2-year survival rates were 54.7% (95% confidence interval 45.3–64.1%) and 34.2% (95% confidence interval 23.1–45.3%). Local tumor control was achieved in 91.3% of the patients. Conclusions The results of this study support the use of a multiple stereotactic approach in cases of multiple and cystic brain metastasis.

Skull base aneurysmal bone cyst presenting with hydrocephalus: progressive residuum obliterated by Gamma Knife stereotactic radiosurgery in a pediatric patient

2020 ◽  
Vol 26 (1) ◽  
pp. 76-81
Author(s):  
George H. Tse ◽  
Feng Y. Jiang ◽  
Matthias W. R. Radatz ◽  
Saurabh Sinha ◽  
Hesham Zaki
Keyword(s):  
Skull Base ◽  
Stereotactic Radiosurgery ◽  
Gamma Knife ◽  
Pediatric Population ◽  
Bone Cyst ◽  
Disease Free Survival ◽  
Long Term Follow Up ◽  
Aneurysmal Bone Cysts ◽  
Gamma Knife Stereotactic Radiosurgery

Aneurysmal bone cysts (ABCs) are an uncommon entity predominantly encountered in the pediatric population. The skull is rarely involved, but these cysts have been reported to arise in the skull base. Traditional treatment has been with surgery alone; however, there is a gathering body of literature that reports alternative treatments that can achieve long-term disease-free survival. However, these therapies are predominantly directed at peripheral skeletal lesions. To the authors’ knowledge, this report is the first to describe long-term follow-up of the efficacy of Gamma Knife stereotactic radiosurgery for treatment of ABC residuum in the skull base that resulted in long-term patient stability and likely ABC obliteration.

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