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intraoperative MRI

Nebras M Warsi, Oliver Lasry, Adel Farah, Christine Saint-Martin, Jose L Montes, Jeffrey Atkinson, Jean-Pierre Farmer, Roy W R Dudley
PURPOSE: Three-tesla intraoperative MRI (iMRI) is a promising tool that could help confirm complete resections and disconnections in pediatric epilepsy surgery, leading to improved outcomes. However, a large proportion of epileptogenic pathologies in children are poorly defined on imaging, which brings into question the utility of iMRI for these cases. Our aim was to compare postoperative seizure outcomes between iMRI- and non-iMRI-based epilepsy surgeries. METHODS: We performed a comparative retrospective analysis of non-iMRI- versus iMRI-based epilepsy surgeries with 2-year follow-up...
October 18, 2016: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
Pedro Roldán, Sergio García, Josep González, Luis Alberto Reyes, Jorge Torales, Ricard Valero, Laura Oleaga, Joaquim Enseñat
OBJECTIVES: Intra-operative magnetic resonance imaging (iMRI) is a recently introduced tool in the most advanced neurosurgical operating rooms worldwide. We present our preliminary experience in brain tumour surgery with low field PoleStar N30® intraoperative MRI since its introduction in 2013 in the Barcelona Clinic Hospital. MATERIAL AND METHODS: A prospective non-randomised study was conducted on cases operated on using iMRI and intention of complete removal up to October 2015...
October 14, 2016: Neurocirugía
Marco Krengli, Carla Pisani, Letizia Deantonio
The guidelines of the European and American Societies of Radiation Oncology (GEC-ESTRO and ASTRO) defined the selection criteria to offer partial breast irradiation (PBI) after lumpectomy in patients with low risk breast cancer regardless pre-operative staging. A recent publication by Tallet et al. explored the impact of preoperative magnetic resonance imaging (MRI) on patient eligibility for PBI. From their study, an ipsilateral BC was detected in 4% of patients, excluding these patients from intraoperative radiotherapy (IORT)...
September 2016: Journal of Thoracic Disease
Mutlu Cobanoglu, Ferit Tufan Ozgezmez, Imran Kurt Omurlu, Ilhan Ozkan, Sevki Oner Savk, Emre Cullu
BACKGROUND: Anterior cruciate ligament (ACL) reconstruction with ST autograft is sometimes unsuccessful because of harvested thin graft. Magnetic resonance imaging (MRI) can be a useful tool to evaluate the thickness of the graft. This study is performed to evaluate whether there is any correlation between diameters and cross-sectional area (CSA) of the semitendinosus tendon (ST) on the preoperative magnetic MRI and the diameter of the 4-stranded ST autograft in ACL reconstruction. MATERIALS AND METHODS: Seventy patients who underwent single-bundle ACL reconstruction with 4-stranded ST for full-thickness ACL ruptures were included in this study...
September 2016: Indian Journal of Orthopaedics
Rens Verhagen, P Richard Schuurman, Pepijn van den Munckhof, M Fiorella Contarino, Rob M A de Bie, Lo J Bour
OBJECTIVE: The correspondence between the anatomical STN and the STN observed in T2-weigthed MRI images used for deep brain stimulation (DBS) targeting remains unclear. Using a new method, we compared the STN borders seen on MRI images with those estimated by intraoperative microelectrode recordings (MER). APPROACH: We developed a method to automatically generate a detailed estimation of STN shape and the location of its borders, based on multiple-channel MER measurements...
October 14, 2016: Journal of Neural Engineering
Tao Xie, Wei Sun, Xiaobiao Zhang, Tengfei Liu, Hailing Ding, Fan Hu, Yong Yu, Ye Gu
BACKGROUND: In this study, we investigated the value of three-dimensional (3D) fast-imaging employing steady-state acquisition (FIESTA) magnetic resonance imaging (MRI) in detecting non-iatrogenic cerebrospinal fluid (CSF) rhinorrhoea and compared it with regular MRI and 3D magnetisation prepared rapid acquisition gradient echo (MPRAGE) MRI sequences, as well as high-resolution computed tomography (HRCT) imaging. We also present the endoscopic experiences of such cases. METHOD: From June 2011 to Feb 2016, 17 patients with non-iatrogenic cerebrospinal fluid rhinorrhoea were included...
October 13, 2016: Acta Neurochirurgica
Robert Gabriel Coumine Riis, Henrik Gudbergsen, Ole Simonsen, Marius Henriksen, Nasir Al-Mashkur, Mikkel Eld, Kristian Kjær Petersen, Olga Kubassova, Anne C Bay Jensen, Janus Damm, Henning Bliddal, Lars Arendt-Nielsen, Mikael Ploug Boesen
OBJECTIVES: To investigate the association between MRI, macroscopic and histological assessments of synovitis in end-stage knee osteoarthritis (KOA). METHODS: Synovitis of end-stage osteoarthritic knees was assessed using non-contrast-enhanced (CE), CE-MRI and dynamic-CE (DCE)-MRI prior to total knee replacement and correlated with microscopic and macroscopic assessments of synovitis obtained intraoperatively. Multiple bivariate correlations were used with a pre-specified threshold of 0...
October 10, 2016: Osteoarthritis and Cartilage
Haiyan Liao, Detai Li, Bing Zhou, Jun Liu, Yajun Li, Hui Liu, Yuzhi Wu, Xiongzhao Zhu, Changlian Tan
BACKGROUND AND PURPOSE: The purpose of this study was to analyze the computed tomography (CT) and magnetic resonance imaging (MRI) features of cerebral sparganosis to improve the accuracy of diagnosing cerebral sparganosis with medical imaging modalities. MATERIALS AND METHODS: This was a retrospective study of CT and MRI features of 12 patients with cerebral sparganosis. A comparative analysis between imaging findings, and intraoperative and postoperative pathological findings was performed...
October 7, 2016: Journal of Neuroradiology. Journal de Neuroradiologie
Tina T Thomas, Daniel H Teitelbaum, Ethan A Smith, Jonathan R Dillman, Ranjith Vellody, Marcus D Jarboe
PURPOSE: Surgical procedures for high imperforate anus have ranged from the posterior sagittal anorectoplasty (PSARP) to laparoscopic-assisted anorectoplasty (LAARP). PSARP bisects the sphincter muscle complex, introducing muscle injury and scarring. LAARP uses a straight trocar to traverse an often non-linear sphincter muscle complex. MRI-assisted LAARP (MRI-LAARP) guides the neorectum precisely through the middle of the entire sphincter complex along its trajectory. We present our experience utilizing MRI intraoperatively during LAARP...
October 8, 2016: Pediatric Surgery International
Justin A Neira, Timothy H Ung, Jennifer S Sims, Hani R Malone, Daniel S Chow, Jorge L Samanamud, George J Zanazzi, Xiaotao Guo, Stephen G Bowden, Binsheng Zhao, Sameer A Sheth, Guy M McKhann, Michael B Sisti, Peter Canoll, Randy S D'Amico, Jeffrey N Bruce
OBJECTIVE Extent of resection is an important prognostic factor in patients undergoing surgery for glioblastoma (GBM). Recent evidence suggests that intravenously administered fluorescein sodium associates with tumor tissue, facilitating safe maximal resection of GBM. In this study, the authors evaluate the safety and utility of intraoperative fluorescein guidance for the prediction of histopathological alteration both in the contrast-enhancing (CE) regions, where this relationship has been established, and into the non-CE (NCE), diffusely infiltrated margins...
October 7, 2016: Journal of Neurosurgery
Bianyun Cai, Zhongbing Huang, Zhi Wu, Lei Wang, Guangfu Yin, Fabao Gao
The development of multimodal probes with magnetic resonance imaging (MRI) and intraoperative fluorescence imaging is the most challenging task in the field of tumor diagnosis. Herein, a simple one-pot hydrothermal method is used to prepare Eu-doped Gd(OH)3 nanorods (Gd(OH)3:Eu NRs) with good fluorescence and the longitudinal relaxivity r1 value of 4.78 (Gd mM s(-1)). After dual-functionalized maleimide-polyethylene glycol-succinimide (Mal-PEG-NHS) macromolecules are coated on the surface of Gd(OH)3:Eu NRs (PEG-NRs), the results of a lower degradation ratio in newborn calf serum (NCS), reactive oxygen species (ROS) generation in L929 cells and the hemolytic rate of PEG-NRs show their good cyto-compatibility and longer blood circulation time...
September 13, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
Florian Schmaranzer, Pascal C Haefeli, Markus S Hanke, Emanuel F Liechti, Stefan F Werlen, Klaus A Siebenrock, Moritz Tannast
BACKGROUND: Delayed gadolinium-enhanced MRI of cartilage (dGEMRIC) allows an objective, noninvasive, and longitudinal quantification of biochemical cartilage properties. Although dGEMRIC has been used to monitor the course of cartilage degeneration after periacetabular osteotomy (PAO) for correction of hip dysplasia, such longitudinal data are currently lacking for femoroacetabular impingement (FAI). QUESTIONS/PURPOSES: (1) How does the mean acetabular and femoral dGEMRIC index change after surgery for FAI at 1-year followup compared with a similar group of patients with FAI treated without surgery? (2) Does the regional distribution of the acetabular and femoral dGEMRIC index change for the two groups over time? (3) Is there a correlation between the baseline dGEMRIC index and the change of patient-reported outcome measures (PROMs) at 1-year followup? (4) Among those treated surgically, can dGEMRIC indices distinguish between intact and degenerated cartilage? METHODS: We performed a prospective, comparative, nonrandomized, longitudinal study...
October 5, 2016: Clinical Orthopaedics and related Research
Martijn G M Schotanus, Daphne A L Schoenmakers, Rob Sollie, Nanne P Kort
PURPOSE: Patients-specific instruments (PSI) for implantation of total knee arthroplasty (TKA) can be used to predict the implant size for both the femur and the tibia component. This study aims to determine the impact of approval of the PSI planning for TKA on the frequency of, and reason for intraoperative changes of implant sizes. METHODS: The clinical records of 293 patients operated with MRI- (90.4 %) and CT-based (9.6 %) PSI were reviewed for actual used implant size...
October 5, 2016: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
Anna-Lisa Kofahl, Sebastian Theilenberg, Jakob Bindl, Deniz Ulucay, Judith Wild, Sylvia Napiletzki, Birgit Schu-Schätter, Alexandra Vohlen, Bogdan Pintea, Jürgen Finsterbusch, Elke Hattingen, Carsten Urbach, Karl Maier
PURPOSE: It is well known that pathological changes in tissue alter its mechanical properties. This holds also true for brain tissue. In case of the brain, however, obtaining information about these properties is hard due to the surrounding cranial bone. In this paper a novel technique to create an imaging contrast based on the aforementioned properties is presented. METHODS: The method is based on an excitation of the brain induced by a short fall. The response of the brain tissue is measured using a motion sensitive MRI sequence...
October 3, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
Lu Gao, Xiaopeng Guo, Rui Tian, Qiang Wang, Ming Feng, Xinjie Bao, Kan Deng, Yong Yao, Wei Lian, Renzhi Wang, Bing Xing
PURPOSE: Pituitary abscess (PA) is rare and commonly described in case reports or small case series. This study aimed to better determine salient clinical manifestations related to the diagnosis and appropriate treatment of PA using by far the largest case series of this disease. METHODS: A total of 6361 consecutive patients underwent surgery for pituitary diseases in Peking Union Medical College Hospital between January 1991 and December 2013. Among this cohort, sixty-six patients were diagnosed with PA based on both intraoperative findings and postoperative histopathological evidence...
September 30, 2016: Pituitary
Stefan Linsler, Sebastian Antes, Sebastian Senger, Joachim Oertel
OBJECTIVE: The safety of endoscopic skull base surgery can be enhanced by accurate navigation in preoperative computed tomography (CT) and magnetic resonance imaging (MRI). Here, we report our initial experience of real-time intraoperative CT-guided navigation surgery for pituitary tumors in childhood. MATERIALS AND METHODS: We report the case of a 15-year-old girl with a huge growth hormone-secreting pituitary adenoma with supra- and perisellar extension. Furthermore, the skull base was infiltrated...
October 2016: Journal of Neurosciences in Rural Practice
Ahmed Abdullah, Hisham El Shitany, Waleed Abbass, Amr Safwat, Amr K Elsamman, Ehab El Refaee
OBJECTIVES: Surgical resection of low-grade gliomas (LGGs) in eloquent areas is one of the challenges in neurosurgery, using assistant tools to facilitate effective excision with minimal postoperative neurological deficits has been previously discussed (awake craniotomy and intraoperative cortical stimulation); however, these tools could have their own limitations thus implementation of a simple and effective technique that can guide to safe excision is needed in many situations. MATERIALS AND METHODS: The authors conducted a retrospective analysis of a prospectively collected data of 76 consecutive surgical cases of LGGs of these 21 cases were situated in eloquent areas...
October 2016: Journal of Neurosciences in Rural Practice
Jonathan P Riley, Andrew B Boucher, Denise S Kim, Daniel L Barrow, Matthew R Reynolds
BACKGROUND: Transorbital intracranial penetrating trauma (TIPT) with a retained intracranial foreign body is a rare event lacking a widely-accepted diagnostic and therapeutic algorithm. Intraoperative catheter angiography (IOA) has been advocated by some authorities to rule out cerebrovascular injury prior and/or subsequent to removal of the object, but no standard of care currently exists. CASE DESCRIPTION: A 19-year-old male was involved in a construction site accident whereby a framing nail penetrated the left globe, traversed the lateral bony orbit, and terminated in the mid-temporal lobe...
September 28, 2016: World Neurosurgery
Alvin Y Chan, Diem Kieu T Tran, Amandip S Gill, Frank P K Hsu, Sumeet Vadera
Laser interstitial thermal therapy (LITT) is a minimally invasive procedure used to treat a variety of intracranial lesions. Utilization of robotic assistance with stereotactic procedures has gained attention due to potential for advantages over conventional techniques. The authors report the first case in which robot-assisted MRI-guided LITT was used to treat radiation necrosis in the posterior fossa, specifically within the cerebellar peduncle. The use of a stereotactic robot allowed the surgeon to perform LITT using a trajectory that would be extremely difficult with conventional arc-based techniques...
October 2016: Neurosurgical Focus
David Y A Dadey, Ashwin A Kamath, Matthew D Smyth, Michael R Chicoine, Eric C Leuthardt, Albert H Kim
OBJECTIVE The precision of laser probe insertion for interstitial thermal therapy of deep-seated lesions is limited by the method of stereotactic guidance. The objective of this study was to evaluate the feasibility of customized STarFix 3D-printed stereotactic platforms to guide laser probe insertion into mesiotemporal and posterior fossa targets. METHODS The authors conducted a retrospective review of 5 patients (12-55 years of age) treated with laser interstitial thermal therapy (LITT) in which STarFix platforms were used for probe insertion...
October 2016: Neurosurgical Focus
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