Point Of View: Computed Tomographic and Magnetic Resonance Imaging of Chronic Odontoid Fractures

Spine ◽  
1999 ◽  
Vol 24 (2) ◽  
pp. 162
Author(s):  
Robert A. Hart
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Point Of View ◽  
Resonance Imaging ◽  
Odontoid Fractures ◽  
Computed Tomographic

ISOLATION OF THE BRAIN‐RELATED FACTOR OF THE ERROR BETWEEN INTENDED AND ACHIEVED POSITION OF DEEP BRAIN STIMULATION ELECTRODES IMPLANTED INTO THE SUBTHALAMIC NUCLEUS FOR THE TREATMENT OF PARKINSON'S DISEASE

2009 ◽  
Vol 64 (suppl_5) ◽  
pp. ons374-ons384 ◽  
Author(s):  
Slawomir Daniluk ◽  
Keith G. Davies ◽  
Peter Novak ◽  
Thai Vu ◽  
Jules M. Nazzaro ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Deep Brain Stimulation ◽  
Magnetic Resonance ◽  
Subthalamic Nucleus ◽  
Brain Stimulation ◽  
Related Factor ◽  
Technical Error ◽  
Resonance Imaging ◽  
Computed Tomographic ◽  
Deep Brain

Abstract OBJECTIVE Although a few studies have quantified errors in the implantation of deep brain stimulation electrodes into the subthalamic nucleus (STN), a significant trend in error direction has not been reported. We have previously found that an error in axial plane, which is of most concern because it cannot be compensated for during deep brain stimulation programming, had a posteromedial trend. We hypothesized that this trend results from a predominance of a directionally oriented error factor of brain origin. Accordingly, elimination of nonbrain (technical) error factors could augment this trend. Thus, implantation accuracy could be improved by anterolateral compensation during target planning. METHODS Surgical technique was revised to minimize technical error factors. During 22 implantations, targets were selected on axial magnetic resonance imaging scans up to 1.5 mm anterolateral from the STN center. Using fusion of postoperative computed tomographic and preoperative magnetic resonance imaging scans, implantation errors in the axial plane were obtained and compared with distances from the lead to the STN to evaluate the benefit of anterolateral compensation. RESULTS Twenty errors and the mean error had a posteromedial direction. The average distances from the lead to the target and to the STN were 1.7 mm (range, 0.8–3.1 mm) and 1.1 mm (range, 0.1–1.9 mm), respectively. The difference between the 2 distances was significant (paired t test, P < 0.0001). The lower parts of the lead were consistently bent in the posteromedial direction on postoperative scout computed tomographic scans, suggesting that a brain-related factor is responsible for the reported error. CONCLUSION Elimination of the technical factors of error during STN deep brain stimulation implantation can result in a consistent posteromedial error. Implantation accuracy may be improved by compensation for this error in advance.

Primary Intrasellar Microgerminoma Detected by Magnetic Resonance Imaging: Case Report

Neurosurgery ◽  
1989 ◽  
Vol 25 (3) ◽  
pp. 458-462 ◽  
Author(s):  
Mariko Oishi ◽  
Takaharu Iida ◽  
Misako Koide ◽  
Yoshiharu Akazawa ◽  
Yoshie Azuma ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Hormone Secretion ◽  
Growth Hormone Secretion ◽  
Sella Turcica ◽  
Posterior Lobe ◽  
Resonance Imaging ◽  
Pituitary Fossa ◽  
Computed Tomographic ◽  
Initial Symptoms

Abstract A case of primary intrasellar germinoma in a 24-year-old woman is presented. Her initial symptoms were diabetes insipidus and headaches. The neurological examination found no abnormalities, but the endocrinological examination disclosed a deficiency in growth hormone secretion. Her skull x-ray revealed a normal sella turcica, and a computed tomographic scan revealed no abnormal mass in the pituitary fossa, but a slightly enlarged stalk. Magnetic resonance imaging revealed a small tumor in the posterior lobe. Transsphenoidal exploration revealed a germinoma in the posterior pituitary lobe. Six cases of primary intrasellar germinoma, including our case, were reviewed. Our case is considered to be the smallest intrasellar germinoma yet reported.

Ultrasonographic, computed tomographic and magnetic resonance imaging anatomy of the normal canine stifle joint

2007 ◽  
Vol 174 (2) ◽  
pp. 351-361 ◽  
Author(s):  
Marta Soler ◽  
José Murciano ◽  
Rafael Latorre ◽  
Eliseo Belda ◽  
Maria J. Rodrı´guez ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Resonance Imaging ◽  
Computed Tomographic ◽  
Stifle Joint ◽  
Canine Stifle

Case Study of a Rare Incidence of a Leiomyosarcoma Mass Occluding the Distal Femoral Vein

2021 ◽  
pp. 875647932110440
Author(s):  
Tammy Perkins ◽  
Kelly McDonald ◽  
Douglas Clem
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Lower Extremity ◽  
Femoral Artery ◽  
Femoral Vein ◽  
Lower Leg ◽  
Resonance Imaging ◽  
Computed Tomographic ◽  
Magnetic Resonance Imaging Mri

This is a case study of a 47-year-old Caucasian male whose chief concern was left lower leg swelling for 1 month. A unilateral lower extremity venous duplex examination was performed. The results concluded that the distal femoral vein was occluded to the distal popliteal vein. Incidentally, a hypoechoic region in the distal thigh near the distal femoral artery was noted by the technologist. The patient was placed on anticoagulation and was told to return for further examination if there was no relief. Three months later, the patient continued to experience lower left leg swelling and returned for another sonogram. The hypoechoic region was seen again in the distal thigh and remained occluded. A computed tomographic arterial (CT-A) and magnetic resonance imaging (MRI) were ordered for further investigation of the hypoechoic area. The CT-A and the MRI revealed the presence of a mass in the distal thigh. The mass was biopsied and diagnosed as a leiomyosarcoma, grade 1. The mass caused the compression and occlusion of the distal femoral vein. The mass was removed, along with a portion of the distal femoral artery due to involvement of the artery within the mass. The artery was repaired with a graft.

scholarly journals Success of scaphoid nonunion surgery is independent of proximal pole vascularity

2017 ◽  
Vol 43 (1) ◽  
pp. 32-40 ◽  
Author(s):  
Schneider K. Rancy ◽  
Morgan M. Swanstrom ◽  
Edward F. DiCarlo ◽  
Darryl B. Sneag ◽  
Steve K. Lee ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Histopathological Analysis ◽  
Resonance Imaging ◽  
Proximal Pole ◽  
Level Of Evidence ◽  
Intraoperative Bleeding ◽  
Tomographic Images ◽  
Computed Tomographic ◽  
Prospective Longitudinal

We followed 35 consecutive patients with scaphoid nonunions in a prospective longitudinal registry. All nonunions were treated with curettage, non-vascularized autogenous grafting and headless screw fixation. Preoperative magnetic resonance imaging, intraoperative bleeding points and histopathological analysis of cancellous bone in the proximal pole were recorded as measures of viability. Healing was categorized as ≥50% bony bridging on computed tomographic images in the plane of the scaphoid. Nine of 23 proximal poles demonstrated ischaemia on magnetic resonance imaging but none were interpreted as infarcted. Twenty-eight of 33 were found to have impaired vascularity as assessed by intraoperative bleeding. Fourteen of 32 demonstrated ≥50% trabecular necrosis and four of 33 demonstrated ≥50% tissue necrosis on histopathological analysis. Thirty of 33 demonstrated focal or robust remodelling activity. Despite pathological evidence of impaired vascularity in over half of the patients, 33 of the 35 scaphoids had healed by 12 weeks. We conclude that proximal pole infarction is decidedly rare and that vascularized bone grafting is seldom required. Level of evidence: IV

DEPICTION OF SMALL VEINS DRAINING INTO THE VEIN OF GALEN USING PREOPERATIVE 3‐DIMENSIONAL NAVIGATION IN LIVING PATIENTS

2009 ◽  
Vol 64 (suppl_5) ◽  
pp. ons247-ons252 ◽  
Author(s):  
Mario Giordano ◽  
Karsten H. Wrede ◽  
Lennart H. Stieglitz ◽  
Laura Columbano ◽  
Madjid Samii ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Digital Subtraction Angiography ◽  
Pineal Region ◽  
Digital Subtraction ◽  
Vein Of Galen ◽  
Resonance Imaging ◽  
3 Dimensional ◽  
Small Vessels ◽  
Computed Tomographic

Abstract OBJECTIVE The purpose of this study was to delineate the anatomy of the precentral cerebellar vein, superior vermian vein, and internal occipital vein using reconstructions of computed tomographic and magnetic resonance imaging scans with navigation software. These data were compared with previous anatomic and angiographic findings to show the resolution and accuracy of the system. METHODS We retrospectively reviewed 100 patients with intracranial pathologies (50 computed tomographic scans with contrast and 50 magnetic resonance imaging scans with gadolinium) using a neuronavigation workstation for 3-dimensional reconstruction. Particular attention was paid to depiction of the precentral cerebellar vein, superior vermian vein, and internal occipital vein. The data were reviewed and analyzed. RESULTS The precentral cerebellar vein, superior vermian vein, and its tributary, the supraculminate vein, were depicted in 52 (52%) patients. The internal occipital vein was delineated on 99 (49.5%) sides and joined the basal vein and vein of Galen in 39 (39.4%) and 60 (60.6%) hemispheres, respectively. Comparing these results with previous angiographic studies, the ability of the neuronavigation system for depicting these vessels is similar to that of digital subtraction angiography. CONCLUSION This study illustrates the possibility of depicting the small vessels draining into the pineal region venous complex using 3-dimensional neuronavigation with an accuracy comparable to that of digital subtraction angiography. This tool provides important information for both surgical planning and intraoperative orientation.

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