scholarly journals Clinical impact of magnetic resonance imaging distortions on gamma knife radiosurgery

2021 ◽  
Author(s):  
Sinead Jacobson ◽  
Catherine Jones ◽  
Ryan Lusk ◽  
Mike Jenkins ◽  
Crispen Chamunyonga ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Gamma Knife ◽  
Gamma Knife Radiosurgery ◽  
Clinical Impact ◽  
Resonance Imaging

Can magnetic resonance imaging alone accurately define the arteriovenous nidus for gamma knife radiosurgery?

2002 ◽  
Vol 97 ◽  
pp. 464-470 ◽  
Author(s):  
E. J. St. George ◽  
P. Butler ◽  
P. N. Plowman
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Mr Imaging ◽  
Gamma Knife ◽  
Gamma Knife Radiosurgery ◽  
Resonance Imaging ◽  
Systemic Complications ◽  
Content Type ◽  
Weighted Sequences ◽  
Fine Print

Object. Current radiosurgical treatment of arteriovenous malformations (AVMs) relies on planning protocols that integrate data from both magnetic resonance (MR) imaging and stereotactic angiography studies. Angiography, however, is invasive and associated with a small but well-defined risk of neurological and systemic complications. Magnetic resonance imaging, on the other hand, is noninvasive with multiplanar capability, demonstrates good anatomical detail, and has been shown to be superior to angiography in the delineation of selected AVMs. Methods. In this study, MR imaging—related accuracy of defining the AVM nidus in gamma knife radiosurgery is investigated using only T1- and T2-weighted sequences. Conclusions. Little interobserver variability was observed and AVM nidi, as demonstrated on T1- and T2-weighted MR images, were well correlated in terms of size. The displacement of the new target, however, from the original nidus, was not predictable and occasionally was significant, thus precluding safe radiosurgical planning.

Trigeminal Nerve-Blood Vessel Relationship as Revealed by High-resolution Magnetic Resonance Imaging and Its Effect on Pain Relief after Gamma Knife Radiosurgery for Trigeminal Neuralgia

Neurosurgery ◽  
2002 ◽  
Vol 50 (6) ◽  
pp. 1261-1267 ◽  
Author(s):  
Ronald Brisman ◽  
Alexander G. Khandji ◽  
Robertus B.M. Mooij
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
High Resolution ◽  
Pain Relief ◽  
Blood Vessel ◽  
Trigeminal Neuralgia ◽  
Gamma Knife ◽  
Trigeminal Nerve ◽  
Gamma Knife Radiosurgery ◽  
Resonance Imaging

Abstract OBJECTIVE Blood vessel (BV) compression of the trigeminal nerve (Cranial Nerve [CN] V) is a common cause of trigeminal neuralgia (TN). High-resolution magnetic resonance imaging scans obtained during gamma knife radiosurgery (GKRS) in patients with TN may be used to analyze the BV-CN V relationship. Follow-up data from a large series of patients treated with GKRS for TN were used to provide information regarding the BV-CN V relationship and pain relief. METHODS T1-weighted, axial 1-mm-thick volume acquisition magnetic resonance imaging scans were obtained through the area of CN V at its exit from the brainstem after injection of 15 ml of gadolinium. The BV-CN V relationship on the symptomatic side that was treated with GKRS was categorized into the following groups: Group 1 (no close relationship), Group 2 (BV close to CN V but not touching it), and Groups 3 and higher (BV-CN V contact). RESULTS A total of 181 symptomatic nerves were studied in 179 patients with TN who were treated with GKRS. In BV-CN V Groups 1, 2, and 3 and higher, respectively, were 43 sides (24%), 31 sides (17%), and 107 sides (59%). In 100 sides where there was no surgical procedure before GKRS, 50% or greater pain relief was more likely in those with BV-CN V contact (51 [88%] of 58 sides) than in those without BV-CN V (29 [69%] of 42 sides) (P = 0.024). BV-CN V contact was observed more often in men (55 [69%] of 80 sides) than in women (52 [52%] of 101 sides) (P = 0.023) and more often in patients who had unilateral TN (104 [62%] of 169 patients) rather than bilateral TN (2 [20%] of 10 patients) (P = 0.016). CONCLUSION In patients who have not undergone previous surgery for TN, BV-CN V contact revealed by high-resolution magnetic resonance imaging may indicate a particularly favorable response to GKRS.

Resection Followed by Radiosurgery for Advanced Juvenile Nasopharyngeal Angiofibroma: Report of Two Cases

Neurosurgery ◽  
2003 ◽  
Vol 52 (5) ◽  
pp. 1207-1211 ◽  
Author(s):  
Amos O. Dare ◽  
Kevin J. Gibbons ◽  
Gary M. Proulx ◽  
Robert A. Fenstermaker
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Stereotactic Radiosurgery ◽  
Gamma Knife ◽  
Gamma Knife Radiosurgery ◽  
Residual Tumor ◽  
Advanced Stage ◽  
Resonance Imaging ◽  
Nasopharyngeal Angiofibroma ◽  
Gamma Knife Stereotactic Radiosurgery

Abstract OBJECTIVE AND IMPORTANCE Experience with the management of juvenile nasopharyngeal angiofibroma (JNA) by gamma knife radiosurgery is limited. We report control of the disease in two patients with advanced-stage JNA treated with primary resection followed by gamma knife stereotactic radiosurgery of residual disease. CLINICAL PRESENTATION An 18-year-old man presented with chronic sinusitis, worsening headaches, diplopia, and left-sided facial numbness. A second patient, a 19-year-old man, presented with recurrent epistaxis and nasal congestion. Magnetic resonance imaging findings and endoscopic evaluation in each patient were consistent with advanced-stage JNA. INTERVENTION One patient underwent craniofacial resection with approximately 3.0 cm3of residual tumor in the region of the cavernous sinus. The other patient underwent preoperative embolization followed by a lateral rhinotomy for tumor resection with approximately 4.7 cm3of residual tumor in the right infratemporal fossa. In an attempt to limit radiation to surrounding normal brain, residual tumor in both patients was treated with gamma knife stereotactic radiosurgery. Control of disease was documented by magnetic resonance imaging more than 24 months after treatment. CONCLUSION Short-term control of late-stage JNA was achieved by use of a strategy of primary surgical resection followed by gamma knife radiosurgery of residual tumor in two patients. Establishing the effectiveness and safety of this strategy over conventional methods of managing advanced JNA will require future prospective studies.

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