Percutaneous transthoracic fenestration of an intramedullary neurenteric cyst in the thoracic spine with intraoperative magnetic resonance image navigation and thoracoscopy

2008 ◽  
Vol 9 (5) ◽  
pp. 488-492 ◽  
Author(s):  
Shinobu Takahashi ◽  
Shigehiro MoriKawa ◽  
Yasuo Saruhashi ◽  
Yoshitaka MatsUsue ◽  
Mamoru Kawakami
Keyword(s):  
Magnetic Resonance ◽  
Mr Imaging ◽  
Minimally Invasive ◽  
Magnetic Resonance Image ◽  
Invasive Technique ◽  
Neurenteric Cyst ◽  
Imaging Guidance ◽  
Thoracic Spinal ◽  
Image Navigation ◽  
Congenital Cysts

Neurenteric cysts are rare congenital cysts typically located in the anterior cervical or thoracic spinal canal. The authors report on their experience with the successful treatment of a midthoracic neurenteric cyst in an 8-year-old boy. Percutaneous fenestration via a transthoracic, transvertebral approach with combined thorascopy and intraoperative MR imaging guidance was used, and the cyst showed lasting shrinkage. The authors discuss this minimally invasive technique and its limitations.

MR imaging guidance for minimally invasive procedures

1998 ◽  
Author(s):  
Terence Z. Wong ◽  
Joachim Kettenbach ◽  
Stuart G. Silverman ◽  
Richard B. Schwartz ◽  
Paul R. Morrison ◽  
...  
Keyword(s):  
Mr Imaging ◽  
Minimally Invasive ◽  
Minimally Invasive Procedures ◽  
Invasive Procedures ◽  
Imaging Guidance

Glypican-3 antibody functionalized Prussian blue nanoparticles for targeted MR imaging and photothermal therapy of hepatocellular carcinoma

2014 ◽  
Vol 2 (23) ◽  
pp. 3686-3696 ◽  
Author(s):  
Zhenglin Li ◽  
Yongyi Zeng ◽  
Da Zhang ◽  
Ming Wu ◽  
Lingjie Wu ◽  
...  
Keyword(s):  
Hepatocellular Carcinoma ◽  
Mr Imaging ◽  
Minimally Invasive ◽  
Prussian Blue ◽  
Photothermal Therapy ◽  
Minimally Invasive Technique ◽  
Invasive Technique ◽  
Prussian Blue Nanoparticles ◽  
Mri Guided

MRI-guided photothermal therapy is becoming a more widely accepted minimally invasive technique.

Interactive magnetic resonance imaging—guided management of intracranial cystic lesions by using an open magnetic resonance imaging system

2001 ◽  
Vol 95 (1) ◽  
pp. 15-23 ◽  
Author(s):  
Spyros S. Kollias ◽  
René L. Bernays
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Mr Imaging ◽  
Real Time ◽  
Imaging System ◽  
Resonance Imaging ◽  
Content Type ◽  
Imaging Guidance ◽  
Brain Abscesses ◽  
Fine Print

Object. The authors present their experience with neurosurgical procedures requiring real-time imaging feedback such as aspiration of a cystic structure or abscess cavity, decompression of hydrocephalic ventricles, management of arachnoid cysts, and installation of permanent or temporary drainage conduits, in which interactive magnetic resonance (MR) imaging guidance was used to monitor structural alterations associated with the procedure. Methods. Drainage of eight intraparenchymal brain abscesses in seven patients, decompression of space-occupying cystic or necrotic brain tumors in four patients, and endoscopic management of hydrocephalus associated with arachnoid cysts in three patients were performed using MR imaging—guided frameless stereotaxy in an open-configuration 0.5-tesla superconducting MR imaging system. Intraoperative MR imaging guidance provided accurate information on the course of the surgical procedure and associated intraoperative changes in tissue position, such as the degree of cyst aspiration, the presence or absence of hemorrhage or induced swelling, and changes associated with decompression of adjacent brain parenchyma and the ventricular system. No clinically significant complications were encountered in any patient. There were no targeting errors, and procedural objectives were accomplished in all cases. Conclusions. Drainage of brain abscesses, punctures of cystic or necrotic intracranial lesions with subsequent aspiration, and management of hydrocephalus can be performed safely and accurately by monitoring the procedure using real-time MR imaging to obtain immediate feedback on associated dynamic tissue changes.

scholarly journals The Value of Magnetic Resonance in Assessment of Size, Invasion, Metastasis and Cervical Cancer Stage Classification

2020 ◽  
Vol 36 (2) ◽  
Author(s):  
Doan Van Ngoc ◽  
Bui Van Lenh ◽  
Bui Dieu
Keyword(s):  
Cervical Cancer ◽  
Lymph Node ◽  
Magnetic Resonance ◽  
Mr Imaging ◽  
Magnetic Resonance Image ◽  
Cancer Stage ◽  
Stage Ib ◽  
Study Results ◽  
Stage Classification ◽  
Medical University

This study investigates the value of magnetic resonance (MR) in assessing size, invasion, lymph node metastasis and cervical cancer stage classification in 117 patients who underwent surgery for whole hysterectomy and pelvic lymph node dredge in Vietnam National Cancer Hospital from July 2016 to August 2018. The study results show that tumor size accuracy (Acc) was 93.2%; vaginal invasion Sp was 98.2%; Acc, 96.6%, NPV, 98.2%; parametrial invasion Sp, 98.2%; Acc, 98.3%, NPV, 100%; pelvic wall invasion Acc , 98.3%; Sp was 115/116, 99.1%; NPV, 99.1%; metastatic lymph node Sp, 98.0%; Acc, 88.9%; NPV, 89.8%. The Acc of the value of MR in cervical cancer stage diagnosis from stage IB was 96.1%; and the overall Acc was 82.9%. The study results also show that the use of MRI in combination with clinical examination in size, invasion, metastasis and cervical cancer stage classification is necessary to improve the accuracy of the diagnosis.      Keywords  Cervical cancer, MRI of cervix. References [1] Globocan Cervical Cancer, Estimated Incidence, Mortality and Prevalence Worldwide in 2012. http://globocan.iarc.fr/old/FactSheets/ cancers/cervix - new.asp (accessed 30.06.2017). [2] Sala E, Wakely S, Senior E et al. MRI of malignant neoplasms of the uterine corpus and cervix. AJR Am J Roentgenol 188(6) (2007) 1577. [3] Hricak H, Lacey CG, Sandles LG et al. Invasive cervical carcinoma: comparison of MR imaging and surgical findings. Radiology 166(3) (1988) 623.[4] Ngo Thi Tinh, Research invasive level of cervical cancer on stage IB-IIA by clinical, magnetic resonance image and treatment results at K Hospital from 2007-2009. Doctor of Medicine thesis, Hanoi Medical University, 2011 (in Vietnamese).[5] Doan Van Ngoc. Research image characteristics and values of 1.5 tesla magnetic resonance in stage classification and follow treatment of cervical cancer. Doctor of Medicine thesis, Hanoi Medical University, 201 (in Vietnamese).[6] Susan JF, Ahmed MA, Masako YK et al. The Revised FIGO Staging System for Uterine Malignancies: Implications for MR Imaging. RadioGraphics 32(6) (2012). [7] Corrigendum to: Revised FIGO staging for carcinoma of the cervix uteri; Int J Gynecol Obstet 145 (2019) 129.[8] Hoang Duc Kiet. Magnetic resonance image of abdomen and pelvis. Medical Publishing House, (2016), pp.31-44, 329-334 (in Vietnamese).[9] Bourgioti C, Koutoulidis V, Chatoupis K et al. MRI findings before and after abdominal radical trachelectomy (ART) for cervical cancer: a prospective study and review of the literature. Clin Radiol. 69 (2014) 678.[10] Charis B, Konstantinos C, Lia AM, Current imaging strategies for the evaluation of uterine cervical cancer, World J Radiol, 28; 8(4) (2016) 342.    

Vector analysis of bladder cancer patient setup utilizing a magnetic resonance image-guided radiation therapy (MR-IGRT) system.

2016 ◽  
Vol 34 (2_suppl) ◽  
pp. 412-412
Author(s):  
Benjamin Walker Fischer-Valuck ◽  
Olga L Green ◽  
Hiram Alberto Gay ◽  
Sasa Mutic ◽  
Jeff M. Michalski
Keyword(s):  
Bladder Cancer ◽  
Radiation Therapy ◽  
Magnetic Resonance ◽  
Soft Tissue ◽  
Mr Imaging ◽  
Magnetic Resonance Image ◽  
Normal Tissue ◽  
Image Guided ◽  
Patient Setup ◽  
Vector Shift

412 Background: Inter and intra-fraction anatomy changes in patients undergoing radiation therapy (RT) for bladder cancer (BC) are common but have thus far been studied with implanted fiducial markers, limited quality 2-D orthogonal films and computed tomography (CT). The adverse impact of daily set-up variation could be more significant than appreciated. Our goal was to employ the soft tissue imaging capabilities of an integrated magnetic resonance image-guided RT (MR-IGRT) system to analyze daily positioning. Methods: Fourteen patients with BC were treated on a MR-IGRT system. Patient setup was performed via volumetric MR imaging with a resolution of 0.15 x 0.15 cm. Alignment was performed according to skin marks then shifts assessed by comparing the treatment volume from the planning CT to the daily MR image. 240 pretreatment MR images were analyzed and 3 shifts were recorded for each image. A vector shift was calculated by combining the square root of the combined sum of the shifts squared. Number of times that the vector of combined shifts would have exceeded the planning tumor volume (PTV) was recorded. Results: Daily volumetric MR imaging allowed for accurate alignment and daily monitoring of bladder volume and normal tissue anatomy. Recorded shifts of the treated volume were 0.9±0.5 cm in the right/left direction, 0.7±0.3 cm in the anterior/posterior direction, and 0.7±0.4 cm in the cranio-caudal direction. In 66 (28%) of cases the vector shift was initially greater than the PTV margin. For 2 patients, pre-treatment MR imaging revealed the tumor reduced in size and dose to the bowel would have exceeded constraints, and treatment adaptation was performed to reduce normal tissue toxicity. Using CTCAE criteria, no grade 3 or higher toxicities have been reported. Conclusions: Accurate and reproducible treatment delivery is required to avoid marginal misses to the target volume as well as excess dose to normal tissue. MR-IGRT allows for excellent soft tissue visualization which enables for the avoidance of potential setups errors by allowing daily alignment changes to ensure the target is included in the PTV. It also allows the ability to make treatment changes based on anatomy variations.

Minimally Invasive Insertion of Syringosubarachnoid Shunt for Posttraumatic Syringomyelia: Technical Case Report

2007 ◽  
Vol 61 (suppl_5) ◽  
pp. ONSE331-ONSE332 ◽  
Author(s):  
John E. O’Toole ◽  
Kurt M. Eichholz ◽  
Richard G. Fessler
Keyword(s):  
Magnetic Resonance Imaging ◽  
Spinal Cord ◽  
Magnetic Resonance ◽  
Blood Loss ◽  
Minimally Invasive ◽  
Invasive Technique ◽  
Magnetic Resonance Imaging Scan ◽  
Resonance Imaging ◽  
Posttraumatic Syringomyelia ◽  
Resonance Imaging Scan

Abstract Objective: Symptomatic posttraumatic syringomyelia affects up to 10% of patients with spinal cord injuries and manifests in a delayed manner as progressive sensorimotor changes below the level of the syrinx. Syrinx shunting, and in particular syringosubarachnoid shunting (SSAS), provides neurological improvement or stabilization in at least 50% of these patients. Given the debilitated condition of many of these patients, a minimally invasive approach to the insertion of these devices is desirable. We provide the first report of an SSAS inserted in a minimally invasive fashion through a tubular retractor. Patients and Methods: A 27-year-old woman presented 4 years after C6 to C7 fracture dislocation and incomplete spinal cord injury with increasing pain and spasticity below the midthoracic region. Magnetic resonance imaging scan revealed a midthoracic syrinx that had enlarged on serial imaging. SSAS was inserted using a minimally invasive technique via the X-Tube retractor (Medtronic Sofamor Danek, Memphis, TN). Through a 2.5-cm incision, hemilaminotomy was performed, and a midline durotomy and myelotomy were opened for SSAS insertion under microscopic visualization. Results: Intraoperative ultrasonography revealed successful syrinx decompression after SSAS insertion. The operative time was 150 minutes and estimated blood loss was less than 100 mL. The patient was mobilized on postoperative Day 1 and was discharged 38.5 hours after surgery with resolution of her preoperative symptoms. Postoperative magnetic resonance imaging scan revealed excellent decompression of the syrinx, and through 1 year of follow-up, the patient has had no recurrence of her syrinx-related symptoms. Conclusion: This is the first report of minimal-access insertion of an SSAS. The minimally invasive technique appears to be a safe and effective means of implanting an SSAS. This approach allows for diminished blood loss and early mobilization and transfer to rehabilitation units for these patients.

Presurgical Evaluation in Magnetic Resonance Image-Negative Frontal Lobe Epilepsy

2014 ◽  
Vol 45 (S 01) ◽  
Author(s):  
I. Borggräfe ◽  
C. Vollmar ◽  
A. Lösch ◽  
B. Ertl-Wagner ◽  
L. Gerstl ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Frontal Lobe ◽  
Magnetic Resonance Image ◽  
Frontal Lobe Epilepsy ◽  
Presurgical Evaluation

Magnetic resonance image attributes of the bovine ovarian follicle antrum during development and regression

Reproduction ◽  
2000 ◽  
pp. 311-323 ◽  
Author(s):  
JL Hilton ◽  
GE Sarty ◽  
GP Adams ◽  
RA Pierson
Keyword(s):  
Magnetic Resonance ◽  
Relaxation Rate ◽  
Follicular Fluid ◽  
Magnetic Resonance Image ◽  
Follicular Development ◽  
Physiological Status ◽  
Proton Density ◽  
Dominant Follicle ◽  
Rate Heterogeneity ◽  
Pixel Value

The magnetic resonance images and maps of bovine ovaries acquired at defined phases of follicular development and regression were studied to determine whether magnetic resonance image attributes of the follicular antrum reflect the physiological status of dominant and subordinate ovarian follicles. Ovariectomies were performed at day 3 of wave one, day 6 of wave one, day 1 of wave two and at >/= day 17 after ovulation. The timings of ovariectomies were selected to acquire growing, early static, late static and regressing follicles of the first wave and preovulatory follicles of the ovulatory wave. Pre-selection and subordinate follicles were also available for analysis. Serum samples were taken on the day of ovariectomy and follicular fluid samples were taken after imaging. Numerical pixel value and pixel heterogeneity in a spot representing approximately 95% of the follicular antrum were quantified in T(1)- and T(2)-weighted images. T(1) and T(2) relaxation rates (T(1) and T(2)), proton density, apparent diffusion coefficients and their heterogeneities were determined from the computed magnetic resonance maps. The antra of early atretic dominant follicles showed higher T(2)-weighted mean pixel value (P < 0.008) and heterogeneity (P < 0. 01) and lower T(2) heterogeneity (P < 0.008) than growing follicles. Subordinate follicles in the presence of a preovulatory dominant follicle had higher T(1), T(1) heterogeneity, proton density, proton density heterogeneity, and lower mean pixel value in T(1)-weighted images than subordinate follicles of the anovulatory wave (P < 0.04). T(1) relaxation rate heterogeneity and proton density heterogeneity were positively correlated with follicular fluid oestradiol concentration (r = 0.4 and 0.3; P < 0.04). T(2) relaxation rate heterogeneity was positively correlated with follicular fluid progesterone concentration (r = 0.4; P < 0.008). Quantitative differences in magnetic resonance image attributes of the antrum observed among phases of follicular development and regression coincided with changes in the ability of the dominant follicle to produce steroid hormones and ovulate, and thus were indicative of physiological status and follicular health.

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