scholarly journals Intradural spinal, extramedullary, T4-T5 cavernous hemangioma - case report

2017 ◽  
Vol 31 (1) ◽  
pp. 32-40
Author(s):  
G. Iacob ◽  
B. Rotund ◽  
A. Iancu ◽  
A. Madalan ◽  
Andreea Marinescu ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Cavernous Hemangioma ◽  
Preoperative Diagnosis ◽  
Surgical Planning ◽  
Clinical Course ◽  
Spin Echo ◽  
Magnetic Resonance Images ◽  
Proton Density ◽  
Microsurgical Resection ◽  
Conventional Spin Echo

Abstract A very rare, purely intradural, spinal, extramedullary cavernous hemangioma was fortunately discovered in a 56 years old woman, presenting with bilateral brachial paresthesia. Using conventional spin-echo T1 proton density, T2-weighted magnetic resonance and gadolinium images an intradural spinal T4-T5, an extramedullary cavernous hemangioma was discovered. The patient underwent surgery, with laminectomy and microsurgical resection followed by an uneventful postoperative clinical course. Similar as in cerebral locations a mixed signal intensity in all sequences on magnetic resonance images might be indicative of cavernous hemangioma, rendering a presumptive preoperative diagnosis of the lesion and surgical planning for a good microsurgical resection.

Reducing susceptibility artefacts in magnetic resonance images of the canine stifle following surgery for cranial cruciate ligament deficiency

2012 ◽  
Vol 25 (06) ◽  
pp. 488-497 ◽  
Author(s):  
J. Grierson ◽  
C. R. Lamb ◽  
F. H. David
Keyword(s):  
Magnetic Resonance ◽  
Tibial Plateau ◽  
Cruciate Ligament ◽  
Magnetic Resonance Images ◽  
Proton Density ◽  
Mr Images ◽  
Cranial Cruciate Ligament ◽  
Metallic Implants ◽  
Image Ranking ◽  
Canine Stifle

SummaryBackground: Magnetic resonance (MR) images of the postoperative canine stifle are adversely affected by susceptibility artefacts associated with metallic implants.Objectives: To determine empirically to what extent susceptibility artefacts could be reduced by modifications to MR technique.Methods: Three cadaveric limbs with a tibial plateau levelling osteotomy (TPLO), tibial tuberosity advancement (TTA), or extra-capsular stabilization (ECS) implant, respectively, were imaged at 1.5T. Series of proton density and T2-weighted images were acquired with different combinations of frequency-encoding gradient (FEG) direction and polarity, stifle flexion or extension, echo spacing (ES), and readout bandwidth (ROBW), and ranked. The highest rank (a rank of 1) corresponded to the smallest artefact.Results: Image ranking was affected by FEG polarity (p = 0.005), stifle flexion (p = 0.01), and ROBW (p = 0.0001). For TPLO and TTA implants, the highest ranked images were obtained with the stifle flexed, lateromedial FEG, and medial polarity for dorsal images, and craniocaudal FEG and caudal polarity for sagittal images. For the ECS implant, the highest ranked images were obtained with the stifle extended, a proximodistal FEG and proximal polarity for dorsal images, and craniocaudal FEG and cranial polarity for sagittal images.Clinical significance: Susceptibility artefacts in MR images of postoperative canine stifles do not preclude clinical evaluation of joints with ECS or TTA implants.Part of this study was presented at the Annual Meeting of the American College of Veterinary Radiology, Albuquerque, NM, October 2011.

177 Comparison of Acquired and Synthesized Multiple Spin Echo Magnetic Resonance Images

1985 ◽  
Vol 20 (6) ◽  
pp. S45 ◽  
Author(s):  
D A Feinberg ◽  
C M Mills ◽  
J P Posin ◽  
D A Ortendahl ◽  
N M Hylton ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Spin Echo ◽  
Magnetic Resonance Images

Magnetic resonance imaging/magnetic resonance angiography fusion technique for intraoperative navigation during microsurgical resection of cerebral arteriovenous malformations

2012 ◽  
Vol 32 (5) ◽  
pp. E7 ◽  
Author(s):  
Kimon Bekelis ◽  
Symeon Missios ◽  
Atman Desai ◽  
Clifford Eskey ◽  
Kadir Erkmen
Keyword(s):  
Magnetic Resonance ◽  
Arteriovenous Malformations ◽  
Setup Time ◽  
Magnetic Resonance Images ◽  
Intraoperative Navigation ◽  
Mr Images ◽  
Intraoperative Angiography ◽  
Fusion Technique ◽  
Contrast Enhanced ◽  
Microsurgical Resection

Object Microsurgical resection of arteriovenous malformations (AVMs) is facilitated by real-time image guidance that demonstrates the precise size and location of the AVM nidus. Magnetic resonance images have routinely been used for intraoperative navigation, but there is no single MRI sequence that can provide all the details needed for characterization of the AVM. Additional information detailing the specific location of the feeding arteries and draining veins would be valuable during surgery, and this detail may be provided by fusing MR images and MR angiography (MRA) sequences. The current study describes the use of a technique that fuses contrast-enhanced MR images and 3D time-of-flight MR angiograms for intraoperative navigation in AVM resection. Methods All patients undergoing microsurgical resection of AVMs at the Dartmouth Cerebrovascular Surgery Program were evaluated from the surgical database. Between 2009 and 2011, 15 patients underwent surgery in which this contrast-enhanced MRI and MRA fusion technique was used, and these patient form the population of the present study. Results Image fusion was successful in all 15 cases. The additional data manipulation required to fuse the image sets was performed on the morning of surgery with minimal added setup time. The navigation system accurately identified feeding arteries and draining veins during resection in all cases. There was minimal imaging-related artifact produced by embolic materials in AVMs that had been preoperatively embolized. Complete AVM obliteration was demonstrated on intraoperative angiography in all cases. Conclusions Precise anatomical localization, as well as the ability to differentiate between arteries and veins during AVM microsurgery, is feasible with the aforementioned MRI/MRA fusion technique. The technique provides important information that is beneficial to preoperative planning, intraoperative navigation, and successful AVM resection.

scholarly journals BT-03 A CASE OF ADULT-ONSET MEDULLOBLASTOMA PRESENTING WITH ATYPICAL CLINICAL COURSE AND MAGNETIC RESONANCE IMAGING

2019 ◽  
Vol 1 (Supplement_2) ◽  
pp. ii37-ii37
Author(s):  
Shiro Ohue ◽  
Masashi Watanabe ◽  
Kousuke Kusakabe ◽  
Tomoki Shinohara ◽  
Satoshi Fujiwara ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Fourth Ventricle ◽  
Clinical Course ◽  
Brain Biopsy ◽  
Mass Effect ◽  
Magnetic Resonance Images ◽  
Adult Onset ◽  
Resonance Imaging ◽  
Diffusion Restriction

Abstract An 18-year-old woman gradually developed speech and gait disturbance for seven months. On admission, she presented with cerebellar ataxia and tetraparesis. Magnetic resonance images showed diffuse hyperintense lesions around the fourth ventricle in FLAIR, in addition to lesions of nodular diffusion restriction with enhancement. Heavily T2-weighted images revealed small cystic appearance within this lesion. We diagnosed her as classical medulloblastoma by open brain biopsy. We should consider medulloblastoma as a differential diagnosis of these characteristics around the fourth ventricle, even if magnetic resonance findings are atypical in point of no mass effect and heterogeneous enhancement.

scholarly journals Using a distance map and an active contour model to segment the carotid artery boundary from the lumen contour in proton density weighted magnetic resonance images

2020 ◽  
Vol 123 ◽  
pp. 103901
Author(s):  
Danilo Samuel Jodas ◽  
Maria Francisca Monteiro da Costa ◽  
Tiago A.A. Parreira ◽  
Aledir Silveira Pereira ◽  
João Manuel R.S. Tavares
Keyword(s):  
Magnetic Resonance ◽  
Carotid Artery ◽  
Active Contour ◽  
Active Contour Model ◽  
Magnetic Resonance Images ◽  
Proton Density ◽  
Distance Map ◽  
Contour Model

Prognostic Significance of Magnetic Resonance Imaging of Femoral Marrow in Patients With Myelodysplastic Syndromes

1999 ◽  
Vol 17 (1) ◽  
pp. 277-277 ◽  
Author(s):  
Shojiro Takagi ◽  
Osamu Tanaka ◽  
Hideki Origasa ◽  
Yasusada Miura
Keyword(s):  
Magnetic Resonance ◽  
Myelodysplastic Syndromes ◽  
Myeloid Leukemia ◽  
Spin Echo ◽  
Prognostic Significance ◽  
Magnetic Resonance Images ◽  
Resonance Imaging ◽  
Free Survival ◽  
Recovery Technique ◽  
Pattern Versus

PURPOSE: To investigate whether the abnormalities observed on femoral marrow magnetic resonance images are related to the development of leukemia and survival of patients with myelodysplastic syndromes (MDS). PATIENTS AND METHODS: The findings on magnetic resonance images of the femoral marrow were evaluated over periods of 1 to 92 months (median, 18 months) in 42 consecutive adult patients with newly diagnosed MDS. Magnetic resonance images were obtained by the T1-weighted spin echo method and the short TI inversion recovery technique. RESULTS: Magnetic resonance images showed that the femoral marrow patterns changed from fatty, faint, or nodular to scattered or uniform as the disease progressed. Development of acute myeloid leukemia was observed in only 13 patients whose marrow exhibited a scattered or uniform pattern. The overall survival of the 29 patients with a scattered or uniform marrow pattern was significantly shorter than that of the 13 patients with a fatty, faint, or nodular marrow pattern (10.7% v 73.3% at 7 years; P < .01). The period of leukemia-free survival was also significantly shorter in the patients with a scattered or uniform marrow pattern versus a fatty, faint, or nodular pattern (37.7% v 100% at 7 years; P < .01). CONCLUSION: Magnetic resonance images of the femoral marrow can provide valuable information for assessing the prognosis and determining the most appropriate management of patients with MDS.

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