Preoperative magnetic resonance imaging localization of convexity brain lesions

1995 ◽  
Vol 82 (3) ◽  
pp. 509-510 ◽  
Author(s):  
Ely Ashkenazi ◽  
Shlomo Pomeranz ◽  
Felix Umansky ◽  
John M. Gomori
Keyword(s):  
Magnetic Resonance ◽  
Brain Lesions ◽  
Resonance Imaging ◽  
Cerebral Lesions ◽  
Mr Image ◽  
Content Type ◽  
Preoperative Magnetic Resonance ◽  
The Brain ◽  
Intraoperative Guidance ◽  
Fine Print

✓ The authors present a simple and accurate new technique for preoperative localization of convexity lesions of the brain by means of magnetic resonance (MR) imaging. This method uses measurements from the initial diagnostic MR image and provides precise intraoperative guidance to cortical and subcortical cerebral lesions.

Physiological support and monitoring of critically ill patients during magnetic resonance imaging

1988 ◽  
Vol 68 (2) ◽  
pp. 246-250 ◽  
Author(s):  
Gene H. Barnett ◽  
Allan H. Ropper ◽  
Keith A. Johnson
Keyword(s):  
Magnetic Resonance ◽  
Mr Imaging ◽  
Critically Ill ◽  
Resonance Imaging ◽  
Monitoring Equipment ◽  
Mr Image ◽  
Content Type ◽  
Neurological Patients ◽  
Fine Print ◽  
Electrical Interference

✓ Magnetic resonance (MR) imaging has been largely restricted to patients who are neurologically and hemodynamically stable. The strong magnetic field and radiofrequency transmissions involved in acquiring images are potential sources of interference with monitoring equipment. A method of support and physiological monitoring of critically ill neurosurgical and neurological patients during MR imaging using a 0.6-tesla MR system is reported. This technique has not caused degradation of the MR image due to electrical interference. Adequate preparation and precautions allow many critically ill neurosurgical and neurological patients to safely undergo MR imaging.

Preoperative localization of brain lesions by magnetic resonance imaging with a marking device

1995 ◽  
Vol 82 (3) ◽  
pp. 511-513 ◽  
Author(s):  
Shigeya Tanaka ◽  
Koichi Uetsuhara ◽  
Tetsuzou Tomosugi ◽  
Kouichi Moroki ◽  
Masahiko Yamada ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Brain Lesions ◽  
Preoperative Localization ◽  
Resonance Imaging ◽  
Inexpensive Method ◽  
Content Type ◽  
Intracranial Lesions ◽  
A New Technique ◽  
Fine Print

✓ A new technique for preoperative localization of brain lesions using magnetic resonance imaging and a marking device is described. The projection of lesions, especially superficial brain tumors, is demonstrated on the scalp, with an acceptable tolerance for open procedures. This simple and inexpensive method, which was used in a group of 34 patients, can assist surgeons in planning an operative approach to intracranial lesions.

Optic pathway glioma infiltrating into somatostatinergic pathways in a young boy with gigantism

1994 ◽  
Vol 81 (4) ◽  
pp. 595-600 ◽  
Author(s):  
Thomas J. Manski ◽  
Charles S. Ha worth ◽  
Bertrand J. Duval-Arnould ◽  
Elisabeth J. Rushing
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Optic Pathway Glioma ◽  
Optic Pathway ◽  
Resonance Imaging ◽  
Content Type ◽  
Hyperintense Signal ◽  
Immunocytochemical Studies ◽  
Stereotactic Biopsies ◽  
Fine Print

✓ The authors report gigantism in a 16-month-old boy with an extensive optic pathway glioma infiltrating into somatostatinergic pathways, as revealed by magnetic resonance imaging and immunocytochemical studies. Stereotactic biopsies of areas showing hyperintense signal abnormalities on T2-weighted images in and adjacent to the involved visual pathways provided rarely obtained histological correlation of such areas. The patient received chemotherapy, which resulted in reduction of size and signal intensity of the tumor and stabilization of vision and growth velocity.

Magnetic resonance imaging of spinal arteriovenous malformations

1987 ◽  
Vol 66 (6) ◽  
pp. 830-834 ◽  
Author(s):  
John L. Doppman ◽  
Giovanni Di Chiro ◽  
Andrew J. Dwyer ◽  
Joseph L. Frank ◽  
Edward H. Oldfield
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Arteriovenous Malformations ◽  
High Signal ◽  
Resonance Imaging ◽  
Content Type ◽  
Spinal Arteriovenous Malformations ◽  
Magnetic Resonance Imaging Mri ◽  
Spinal Avm ◽  
Fine Print

✓ Magnetic resonance imaging (MRI) was performed on 12 patients with spinal arteriovenous malformations (AVM's). Six lesions were intramedullary, five were dural, and one was in a posterior extramedullary location. Serpentine filling defects similar to the classic myelographic findings were demonstrated within the high-signal cerebrospinal fluid on T2-weighted coronal scans. The intramedullary nidus was identified by MRI as an area of low-signal intensity within the cord in all six intramedullary AVM's. Neither the dural nor the posterior extramedullary lesions showed intramedullary components. It is concluded that MRI may noninvasively provide the initial diagnosis of a spinal AVM and distinguish intramedullary from dural and extramedullary lesions.

Optic nerve ganglioglioma

1993 ◽  
Vol 78 (6) ◽  
pp. 979-982 ◽  
Author(s):  
William Y. Lu ◽  
Marc Goldman ◽  
Byron Young ◽  
Daron G. Davis
Keyword(s):  
Magnetic Resonance Imaging ◽  
Nervous System ◽  
Optic Nerve ◽  
Magnetic Resonance ◽  
Visual Field ◽  
Resonance Imaging ◽  
Optic Nerve Glioma ◽  
Content Type ◽  
Visual Field Deficit ◽  
Fine Print

✓ Gangliogliomas of the optic nerve are extremely rare. The case is reported of a 38-year-old man who presented with a visual field deficit and was discovered to have an optic nerve ganglioglioma. The possible embryological origins of this neoplasm, its histological and immunohistochemical features, and its appearance on magnetic resonance imaging are examined. The prognoses of optic nerve glioma and of gangliogliomas occurring elsewhere in the nervous system are compared.

Correlation of the relationships of brain—tumor interfaces, magnetic resonance imaging, and angiographic findings to predict cleavage of meningiomas

1999 ◽  
Vol 91 (3) ◽  
pp. 384-390 ◽  
Author(s):  
Faruk İldan ◽  
Metin Tuna ◽  
Alp İskender Göcer ◽  
Bülent Boyar ◽  
Hüseyin Bağdatoğlu ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Brain Tumor ◽  
Magnetic Resonance ◽  
Mr Imaging ◽  
Vascular Supply ◽  
Peritumoral Edema ◽  
Resonance Imaging ◽  
Content Type ◽  
Angiographic Findings ◽  
Fine Print

Object. The authors examined the relationships of brain—tumor interfaces, specific magnetic resonance (MR) imaging features, and angiographic findings in meningiomas to predict tumor cleavage and difficulty of resection.Methods. Magnetic resonance imaging studies, angiographic data, operative reports, clinical data, and histopathological findings were examined retrospectively in this series, which included 126 patients with intracranial meningiomas who underwent operations in which microsurgical techniques were used. The authors have identified three kinds of brain—tumor interfaces characterized by various difficulties in microsurgical dissection: smooth type, intermediate type, and invasive type. The signal intensity on T1-weighted MR images was very similar regardless of the type of brain—tumor interface (p > 0.1). However, on T2-weighted images the different interfaces seemed to correlate very precisely with the signal intensity and the amount of peritumoral edema (p < 0.01), allowing the prediction of microsurgical effort required during surgery. On angiographic studies, the pial—cortical arterial supply was seen to participate almost equally with the meningeal—dural arterial supply in vascularizing the tumor in 57.9% of patients. Meningiomas demonstrating hypervascularization on angiography, particularly those fed by the pial—cortical arteries, exhibited significantly more severe edema compared with those supplied only from meningeal arteries (p < 0.01). Indeed, a positive correlation was found between the vascular supply from pial—cortical arteries and the type of cleavage (p < 0.05).Conclusions. In this analysis the authors proved that there is a strong correlation between the amount of peritumoral edema, hyperintensity of the tumor on T2-weighted images, cortical penetration, vascular supply from pial—cortical arteries, and cleavage of the meningioma. Therefore, the consequent difficulty of microsurgical dissection can be predicted preoperatively by analyzing MR imaging and angiographic studies.

Intracranial chondroma in a patient with Ollier's disease

1989 ◽  
Vol 70 (2) ◽  
pp. 274-276 ◽  
Author(s):  
Robert F. Traflet ◽  
Ashok R. Babaria ◽  
Giancarlo Barolat ◽  
H. T. Doan ◽  
Carlos Gonzalez ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Computerized Tomography ◽  
Diagnostic Value ◽  
Resonance Imaging ◽  
Content Type ◽  
Ollier’S Disease ◽  
Intracranial Chondroma ◽  
Ollier's Disease ◽  
Fine Print

✓ A case is presented in which a solitary chondroma arose from the clivus of a patient with Ollier's disease. These tumors are rare. The diagnostic value of computerized tomography and magnetic resonance imaging is discussed.

Spinal intramedullary tuberculous lesion: medical management

2000 ◽  
Vol 93 (1) ◽  
pp. 137-141 ◽  
Author(s):  
G. Prakash Rao
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Medical Management ◽  
Treatment Protocol ◽  
Resonance Imaging ◽  
Content Type ◽  
Tuberculous Lesion ◽  
Fine Print

✓ The author describes the successful medical management of intramedullary tuberculous lesions in four patients who received treatment between 1994 and 1997. The role of magnetic resonance imaging and the treatment protocol for intramedullary tuberculous lesions are also discussed.

Wegener granulomatosis manifesting as meningitis

2002 ◽  
Vol 97 (5) ◽  
pp. 1229-1232 ◽  
Author(s):  
Takao Yasuhara ◽  
Toru Fukuhara ◽  
Minoru Nakagawa ◽  
Yoshinori Terai ◽  
Kimihiro Yoshino ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Immunosuppressive Therapy ◽  
Antineutrophil Cytoplasmic Antibody ◽  
Resonance Imaging ◽  
Pia Mater ◽  
Meningeal Enhancement ◽  
Wegener Granulomatosis ◽  
Content Type ◽  
Fine Print

✓ The authors describe a unique presentation of Wegener granulomatosis (WG) manifesting predominantly as meningitis. Magnetic resonance imaging demonstrated diffuse meningeal enhancement, including the pia mater, in a 28-yearold man with meningitis. A diagnosis of atypical WG was based on the findings of a dural biopsy sample and an elevated cytoplasmic antineutrophil cytoplasmic antibody (cANCA) titer, although the patient did not have any of the lesions common to WG. Immunosuppressive therapy was quite effective. With treatment, the meningeal enhancement resolved and the cANCA titer normalized. Meningeal granulomatosis as the sole lesion in WG has never been reported in the literature. This atypical course of WG should be noted.

Sources of error in comparing functional magnetic resonance imaging and invasive electrophysiological recordings

2000 ◽  
Vol 93 (2) ◽  
pp. 214-223 ◽  
Author(s):  
Derek L. G. Hill ◽  
Andrew D. Castellano Smith ◽  
Andrew Simmons ◽  
Calvin R. Maurer ◽  
Timothy C. S. Cox ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Healthy Volunteers ◽  
Hand Movement ◽  
Epileptogenic Zone ◽  
Imaging Data ◽  
Functional Magnetic Resonance ◽  
Reliable Technique ◽  
Content Type ◽  
The Brain ◽  
Fine Print

Object. Several authors have recently reported studies in which they aim to validate functional magnetic resonance (fMR) imaging against the accepted gold standard of invasive electrophysiological monitoring. The authors have conducted a similar study, and in this paper they identify and quantify two characteristics of these data that can make such a comparison problematic.Methods. Eight patients in whom surgery for epilepsy was performed and five healthy volunteers underwent fMR imaging to localize the part of the sensorimotor cortex responsible for hand movement. In the patient group subdural electrode mats were subsequently implanted to identify eloquent regions of the brain and the epileptogenic zone. The fMR imaging data were processed to correct for motion during the study and then registered with a postimplantation computerized tomography (CT) scan on which the electrodes were visible. The motion during imaging in the two groups studied, and the deformation of the brain between the preoperative images and postoperative scans were measured.The patients who underwent epilepsy surgery moved significantly more during fMR imaging experiments than healthy volunteers performing the same motor task. This motion had a particularly increased out-of-plane component and was significantly more correlated with the stimulus than in the volunteers. This motion was especially increased when the patients were performing a task on the side affected by the lesion. The additional motion is hard to correct and substantially degrades the quality of the resulting fMR images, making it a much less reliable technique for use in these patients than in others. Also, the authors found that after electrode implantation, the brain surface can shift more than 10 mm relative to the skull compared with its preoperative location, substantially degrading the accuracy of the comparison of electrophysiological measurements made in the deformed brain and fMR studies obtained preoperatively.Conclusions. These two findings indicate that studies of this sort are currently of limited use for validating fMR imaging and should be interpreted with care. Additional image analysis research is necessary to solve the problems caused by patients' motion and brain deformation.

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