Role Of Magnetic Resonance Venography Research Articles

The Role of Magnetic Resonance Venography in Headache Due to Suspected Cerebral Venous Sinus Thrombosis in the Presence of Normal T1 and T2 Dural Sinus Signal

The Role of Magnetic Resonance Venography in Headache Due to Suspected Cerebral Venous Sinus Thrombosis in the Presence of Normal T1 and T2 Dural Sinus Signal

Role of magnetic resonance venography in the evaluation of cerebral venous thrombosis in a tertiary care hospital in rural Tamil Nadu

Background: Cerebral venous sinus thrombosis (CVST) is a common medical problem in India which has serious clinical consequences. MR venographic technique is one of the modalities of choice for diagnosis and evaluation of dural sinus and cerebral venous thrombosis wherever MRI facility is available. The present study was conducted to evaluate the spectrum of magnetic resonance venography in the diagnosis of cerebral venous sinus thrombosis. Material and Methods: It was a record-based study, in which case records of CVST patients who attended the department of radiodiagnosis was reviewed. Total cases included were 30 over the period of 2 years. A complete clinical history of patients followed by general physical examination and detailed central nervous system with examination of other significant system was done. Non contrast MR imaging including T1 sagittal, T2 axial, Fluid Attenuated Inversion Recovery (FLAIR) coronal, axial diffusion weighted images(DWI), Susceptibility weighted images (SWI), 3D T1 Fast field echo (FFE), 2D Time of Flight (TOF) Source images and 3D maximum intensity projection(MIP) images were acquired and evaluated for presence of venous thrombosis as indicated. Data analysis was done. Results: The results of the study showed that the incidence of CVST was more in female population. The peak incidence of CVST was found in the age group of 21 to 40 years. Headache was the commonest clinical feature seen in 09 patients (30%). The superior sagittal sinus is commonly involved in CVST, which is seen in 19 patients (63.33%), the next commonest sinus involved is right transverse sinus in 10 patients (33.3%) followed by right sigmoid sinus in 09 patients (30.0%). Conclusion: This study concluded that MRI and MRV are valuable imaging modalities for the diagnosis of CVST. MRI and non contrast MRV should be recommended as they are safer, non-invasive, non-ionizing and highly accurate modalities.

Evaluation of role of magnetic resonance venography in patients with cerebral venous thrombosis attending BIMS hospital, Belgaum - A retrospective study

Evaluation of role of magnetic resonance venography in patients with cerebral venous thrombosis attending BIMS hospital, Belgaum - A retrospective study

Role of Magnetic Resonance Venography (MRV) for the Assessment of Central Venous Access in Pediatric Intestinal Failure

Role of Magnetic Resonance Venography (MRV) for the Assessment of Central Venous Access in Pediatric Intestinal Failure

Role of magnetic resonance venography in assessment of intra-thoracic central veins in hemodialysis patients

AimTo determine diagnostic accuracy of magnetic resonance venography (MRV) in assessment of the patency and steno-occlusive disease of intrathoracic central veins in hemodialysis patients. Patients and methodsBetween February 2013 and December 2014, 40 hemodialysis patients with suspected intrathoracic central venous stenosis were examined by MRV (phase contrast in 35 patients and contrast enhanced in 5 uncooperative patients). Digital subtraction venography (DSV) was done in the 40 patients and used as the standard reference. The results of MRV were compared with those of DSV. Kappa index with percent agreement between 2 methods was calculated. ResultsThe results showed excellent agreement as MRV detected 140 out of 141 patent, and all 36 stenotic and 62 out of 64 occluded segments of intra-thoracic central veins with k were 1.00, 1.00 and 0.97 and P value=<0.001, 0.001 and 0.023 respectively. MRV had 98.6% sensitivity, 100% specificity and 99.3% accuracy in diagnosis of patency and stenoocclusive disease of central veins. ConclusionMRV is a highly sensitive technique in the diagnosis of patency and steno-occlusive disease of intrathoracic central veins and may be used as an alternative to DSV for the abnormalities of central veins in hemodialysis patients.

Utilization of MRV to evaluate pediatric patients with papilledema

In pediatric patients presenting with papilledema, there is little standardization of the diagnostic work up with respect to initial neuroimaging studies.1 Specifically, the role of magnetic resonance venography (MRV) has not been fully investigated in those patients without risk factors in the clinical history that would warrant a MRV. We sought to investigate the utility of MRV in identifying pediatric patients with dural sinus thrombosis (DST) who present with papilledema.

Role of magnetic resonance venography in evaluation of cerebral veins and sinuses occlusion

IntroductionCerebral venous occlusion (CVO) means intraluminal obstruction by cerebral venous thrombosis (CVT) or external compression. The differential diagnosis is broad including stroke, brain capillary telangiectasia, contusion, hypertensive hemorrhage, metastases and venous vascular malformations. MRI in conjunction with MRV is considered the modality of choice in diagnosis of CVO. ObjectiveTo assess the role of magnetic resonance venography in the evaluation of cerebral veins and sinuses occlusion. MethodsThe study was conducted on 15 patients with cerebral venous occlusion and subjected to MRI and MRV. ResultsThe study included 13 patients with cerebral venous occlusion due to thrombosis and two patients with occlusion by tumors (meningioma). ConclusionMRI in conjunction with MRV is considered an accurate, safe, non-invasive, non-ionizing diagnostic modality in assessing CVO. It can assess parenchymal lesions and detect intraluminal small thrombi and its extension.

Time-resolved imaging of contrast kinetics three-dimensional (3D) magnetic resonance venography in patients with pelvic congestion syndrome

The purpose of this study was to assess the role of magnetic resonance venography (MRV) with time-resolved imaging of contrast kinetics (TRICKS) in dynamically evaluating ovarian vein dilation, reflux and direction of flow in patients with suspected pelvic congestion syndrome (PCS). The hypotheses tested were: (i) That conspicuity scores of the ovarian veins across three raters was greater using TRICKS MRV compared with T2W or T(2)* imaging; (ii) That three key MR variables (ovarian vein diameter, timing and grade of reflux) correlated across all raters. We carried out a retrospective study of 13 patients undergoing T2W and TRICKS MRI and pelvic sonography (n = 4) or catheter venography (n = 5). Three observers rated conspicuity, vessel diameter, timing and grade of ovarian vein reflux for T(2)/T2*W and TRICKS MRI. The mean left ovarian diameter for all patients with reflux was 7.9 mm (range 2.2-12 mm). There was high inter-observer agreement for ovarian vein diameter for both sequences. TRICKS showed significantly greater conspicuity than T(2)/T2*W imaging (TRICKS: T(2)/T2* mean (SD) = 7.80 (3.20):5.50 (1.97), F (1,12) = 5.80, p < 0.05). TRICKS MRV demonstrated high inter-observer correlation for timing and grade of reflux (r (36) = 0.77,0.71,0.79, p < 0.01). TRICKS MRA/V was significantly degraded by breathing artefact in two patients. We conclude that TRICKS MRV accurately and dynamically demonstrates ovarian vein reflux in patients with PCS but requires quiet respiration. TRICKS MRV has better image conspicuity than T(2)/T2*W imaging and sufficient temporal resolution to distinguish between Grade I, II and III reflux.

The 2007 ABJS Nicolas Andry Award: Three Decades of Clinical, Basic, and Applied Research on Thromboembolic Disease after THA

Total hip arthroplasty is an operation with a high risk for venous thromboembolism. Three decades of research conducted at the Hospital for Special Surgery identified the exact timing of the thrombogenic stimulus during surgery, defined the role of magnetic resonance venography, and established the role of certain genetic and acquired predispositions. Based on these studies, we implemented a multimodal prophylaxis consisting of a series of safe preventive measures applied before, during, and immediately after surgery to reduce the risk of venous thromboembolism. If these safe preventive measures are strictly observed, postoperative pharmacologic prophylaxis does not need to be aggressive in the patient without predisposing factors who mobilizes promptly, thus diminishing the risk of bleeding associated with the use of anticoagulants and the overall cost of care. Our clinical experience with more than 5000 total hip arthroplasties performed during the last decade and closely followed prospectively for a minimum of 3 months clearly shows this multimodal prophylaxis is safe and effective resulting in a very low prevalence of thromboembolism.

Magnetic resonance venography of congenital vascular malformations of the extremities.

Contrast angiography can demonstrate the vascular components of a vascular malformation, but can be technically challenging in small patients with complex venous anomalies. We reviewed the role of magnetic resonance venography (MRV) in the evaluation of children with predominantly low-flow, vascular malformations of the extremities. MRV (2D time-of-flight technique) and magnetic resonance (MR) imaging examinations were performed in ten young patients with congenital predominantly low-flow vascular malformations of the extremities. MR imaging was used to characterize and determine the extent of the malformations, and MRV to evaluate the deep and superficial venous channels. In all patients, MRV studies were reviewed in conjunction with contrast angiograms, considered the gold standard, to confirm the findings. All significant channel anomalies seen with contrast angiography were identified with MRV. In addition, MRV demonstrated some veins that were not intentionally opacified during contrast studies. MRV demonstrates both the superficial and deep conducting veins, whereas contrast angiography is a more directed study, evaluating only those channels intentionally opacified. Together, MR imaging and MRV data can non-invasively form the basis for determining the prognosis and choosing the individual treatment of congenital vascular malformations of the extremities.