scholarly journals The antireflux mechanism – Angiographic anatomy and clinical implications

2020 ◽  
Vol 26 (6) ◽  
pp. 691-702 ◽  
Author(s):  
Philippe Gailloud
Keyword(s):  
Spinal Cord ◽  
Clinical Features ◽  
Venous Pressure ◽  
Venous Drainage ◽  
Low Flow ◽  
Clinical Implications ◽  
Clinical Expression ◽  
Arteriovenous Fistulas ◽  
Arteriovenous Shunts ◽  
Retrograde Filling

Background Early anatomists suspected that the radiculomedullary veins draining the spinal cord had valves preventing their retrograde filling with anatomical casting material. Modern investigations have discarded the presence of true valves and introduced instead the notion of a pseudo-valvular configuration for which the term antireflux mechanism was coined in the 1970s. The angiographic anatomy of the antireflux mechanism has not been well documented so far. Methods This article discusses anatomical and clinical features of the antireflux mechanism with a series of 12 angiographic observations documenting the antireflux mechanism under normal and pathological circumstances. Results The antireflux mechanism divides radiculomedullary veins into intradural and extradural segments. While the structure of the antireflux mechanism is not yet fully clarified, it includes at least a tight narrowing of the radiculomedullary vein at its point of passage through the thecal sac, which is angiographically detectable and likely protects the intradural venous system from transient or persistent surges in venous pressure (e.g. sneezing, pregnancy). This tight narrowing of the antireflux mechanism likely also represents an obstacle to normal anterograde flow, potentially leading to venous stagnation and thrombosis. Conclusions The antireflux mechanism includes at least a tight narrowing of the radiculomedullary vein, which likely influences the development and clinical expression of low-flow spinal arteriovenous fistulas and might impact the spinal venous drainage even in the absence of arteriovenous shunts.

Variants of radiculomeningeal vascular malformations of the spine

1987 ◽  
Vol 66 (3) ◽  
pp. 333-337 ◽  
Author(s):  
Leslie D. Cahan ◽  
Randall T. Higashida ◽  
Van V. Halbach ◽  
Grant B. Hieshima
Keyword(s):  
Spinal Cord ◽  
Vascular Malformations ◽  
Venous Pressure ◽  
Venous Drainage ◽  
Venous System ◽  
Low Flow ◽  
Neurological Deficits ◽  
Content Type ◽  
Dorsal Nerve ◽  
Intraspinal Hemorrhage

✓ In recent years, it has become evident that the most common form of arteriovenous malformation to involve the spinal cord in adults is a low-flow fistula with its nidus located on the dura in relation to the dorsal nerve root. This lesion, termed “radiculomeningeal fistula” (RMF), is drained by the intradural coronal venous system and most likely causes neurological deficits due to raised venous pressure within the spinal cord. The therapy that was formerly recommended was multilevel laminectomy with microsurgical stripping of the intradural vessels. However, that procedure focused on the draining veins rather than the nidus, and it has been replaced by direct treatment of the nidus or by disconnecting the nidus from the coronal venous system. This paper reports variants of RMF's that show a wider spectrum of the clinical and radiological findings than has been previously reported. Three patients presenting with extradural venous drainage, intraspinal hemorrhage, and/or sudden non-hemorrhagic neurological decline are reported. A more complete understanding of RMF facilitates the radiological and clinical evaluation of these patients and enables the surgeon to modify the therapy in a significant way.

Concomitant conus medullaris arteriovenous shunts and sacral dural arteriovenous fistulas: pathophysiological links related to the venous drainage of the lesions in a series of five cases

2018 ◽  
Vol 10 (6) ◽  
pp. 586-592 ◽  
Author(s):  
Andrea Rosi ◽  
Arturo Consoli ◽  
Stéphanie Condette-Auliac ◽  
Oguzhan Coskun ◽  
Federico Di Maria ◽  
...  
Keyword(s):  
Spinal Cord ◽  
Young Patients ◽  
Case Series ◽  
Venous Drainage ◽  
Conus Medullaris ◽  
Venous Hypertension ◽  
Arteriovenous Fistulas ◽  
Congenital Origin ◽  
Arteriovenous Shunts ◽  
Dural Arteriovenous Fistulas

BackgroundSpinal cord arteriovenous shunts (scAVSs) are a group of lesions located in the spinal cord itself or in the surrounding structures. The most common scAVSs are spinal dural arteriovenous fistulas (sDAVFs), which are acquired lesions. The pathogenesis of sDAVFs involves thrombosis and venous hypertension as trigger factors. Intradural scAVSs such as spinal cord arteriovenous nidus type malformations (AVMs) and pial arteriovenous fistulas are less common than sDAVFs and are considered to have a so-called ‘congenital’ origin. The association between different concomitant scAVSs is very rare and the association of sDAVFs with intradural scAVSs has been described in only a few case reports.MethodsWe describe a case series of five patients presenting with a conus medullaris AVS associated with a lower lumbar or sacral DAVF.ResultsThree of our patients were <30 years old at presentation. In four of these five cases the intradural scAVS drained caudally, engorging the epidural plexus in the same location as the sDAVF. In only one case, who presented with thrombosis of the drainage of the main compartment of a conus medullaris pial AVF, was the location of the DAVF opposite to the location of the residual drainage.ConclusionWe discuss the pathophysiological link between scAVS and sDAVF on the basis of the rarity of the DAVF, the uncommon association between scAVS and sDAVF, the presence of sDAVF in young patients, and the venous hypertension created by the venous drainage towards the sacral area responsible for angiogenesis creating the dural shunt.

scholarly journals Cervical spinal dural fistulas leading to remote thoracolumbar myelopathy

2019 ◽  
Vol 10 (4) ◽  
pp. 340-343
Author(s):  
Mesha Martinez ◽  
Abderrahmane Hedjoudje ◽  
Carlos Pardo ◽  
Rafael J. Tamargo ◽  
Philippe Gailloud
Keyword(s):  
Spinal Cord ◽  
Cervical Spinal Cord ◽  
Venous Drainage ◽  
Venous Hypertension ◽  
Low Flow ◽  
Cervical Cord ◽  
Arteriovenous Fistulas ◽  
Vascular Myelopathy ◽  
Upper Thoracic ◽  
Spinal Dural Arteriovenous Fistulas

Purpose of reviewSpinal dural arteriovenous fistulas (SDAVFs) are abnormal connections between 1 or more radiculomeningeal arteries and a single radiculomedullary vein draining into the perimedullary venous system. SDAVFs present in older patients with a progressive myelopathy caused by diffuse spinal venous hypertension. The discrepancy between the focal nature of the arteriovenous shunt and the extent of the induced myelopathy is a classic feature of SDAVFs related to the coexistence of diffuse spinal venous drainage impairment.Recent findingsWe describe 3 cases of cervical SDAVFs (at C1, C4, and C7) presenting with a myelopathy that spared the cervical spinal cord and, in 2 instances, the upper thoracic cord. This is to our knowledge the first observations of cervical SDAVFs with MRI showing absent or subtle flow voids and presenting remote thoracolumbar myelopathy without cervical cord involvement.SummaryA considerable distance may separate low-flow spinal arteriovenous fistulas from the spinal cord damage they produce. These observations emphasize the importance of performing a complete spinal angiogram when investigating a vascular myelopathy of any location and extent.

scholarly journals Intracranial hemorrhage from dural arteriovenous fistulas: clinical features and outcome

2013 ◽  
Vol 34 (5) ◽  
pp. E15 ◽  
Author(s):  
David J. Daniels ◽  
Ananth K. Vellimana ◽  
Gregory J. Zipfel ◽  
Giuseppe Lanzino
Keyword(s):  
Clinical Features ◽  
Intracranial Hemorrhage ◽  
Case Series ◽  
Venous Drainage ◽  
Sudden Onset ◽  
Residual Symptoms ◽  
Arteriovenous Fistulas ◽  
Common Location ◽  
Dural Arteriovenous Fistulas

Object In this paper the authors' goal was to review the clinical features and outcome of patients with intracranial dural arteriovenous fistulas (DAVFs) who presented with hemorrhage. Methods A retrospective study of 28 patients with DAVFs who presented with intracranial hemorrhage to 2 separate institutions was performed. The information reviewed included clinical presentation, location and size of hemorrhage, angiographic features, treatment, and clinical and radiologically documented outcomes. Clinical and radiological follow-up were available in 27 of 28 patients (mean follow-up 17 months). Results The vast majority of patients were male (86%), and the most common presenting symptom was sudden-onset headache. All DAVFs had cortical venous drainage, and about one-third were associated with a venous varix. The most common location was tentorial (75%). Treatment ranged from endovascular (71%), surgical (43%), Gamma Knife surgery (4%), or a combination of modalities. The majority of fistulas (75%) were completely obliterated, and most patients experienced excellent clinical outcome (71%, modified Rankin Scale score of 0 or 1). There were no complications in this series. Conclusions Case series, including the current one, suggest that the vast majority of patients who present with intracranial hemorrhage from a DAVF are male. The most common location for DAVFs presenting with hemorrhage is tentorial. Excellent outcomes are achieved with individualized treatment, which includes various therapeutic strategies alone or in combination. Despite the hemorrhagic presentation, almost two-thirds of patients experience a full recovery with no or minimal residual symptoms.

Spinal dural arteriovenous fistula associated with a spinal perimedullary fistula

2006 ◽  
Vol 4 (3) ◽  
pp. 241-245 ◽  
Author(s):  
Timo Krings ◽  
Volker A. Coenen ◽  
Martin Weinzierl ◽  
Marcus H. T. Reinges ◽  
Michael Mull ◽  
...  
Keyword(s):  
Spinal Cord ◽  
Arteriovenous Fistula ◽  
Dural Arteriovenous Fistula ◽  
Vascular Malformations ◽  
Venous Drainage ◽  
Elevated Pressure ◽  
Spinal Dural Arteriovenous Fistula ◽  
Arteriovenous Fistulas ◽  
Progressive Myelopathy ◽  
Dural Arteriovenous Fistulas

✓ Among spinal cord vascular malformations, dural arteriovenous fistulas (DAVFs) must be distinguished from intradural malformations. The concurrence of both is extremely rare. The authors report the case of a 35-year-old man who suffered from progressive myelopathy and who harbored both a DAVF and an intradural perimedullary fistula. During surgery, both fistulas were identified, confirmed, and subsequently obliterated. The fistulas were located at two levels directly adjacent to each other. Although the incidence of concurrent spinal DAVFs is presumed to be approximately 2%, the combination of a dural and an intradural fistula is exceedingly rare; only two other cases have been reported in the literature. One can speculate whether the alteration in venous drainage caused by the (presumably congenital) perimedullary fistula could possibly promote the production of a second dural fistula due to elevated pressure with concomitant venous stagnation and subsequent thrombosis. The authors conclude that despite the rarity of dual pathological entities, the clinician should be aware of the possibility of the concurrence of more than one spinal fistula in the same patient.

Intradural spinal cord arteriovenous shunts in a personal series of 210 patients: novel classification with emphasis on anatomical disposition and angioarchitectonic distribution, related to spinal cord histogenetic units

2021 ◽  
pp. 1-11
Author(s):  
Katsuhiro Mizutani ◽  
Arturo Consoli ◽  
Federico Di Maria ◽  
Stéphanie Condette Auliac ◽  
Anne Boulin ◽  
...  
Keyword(s):  
Spinal Cord ◽  
White Matter ◽  
Vascular Malformations ◽  
Pial Arteries ◽  
Arteriovenous Fistulas ◽  
Specific Distribution ◽  
Arteriovenous Shunts ◽  
Precise Analysis ◽  
Anatomical Localization ◽  
Clinical Records

OBJECTIVE Few classifications of intradural spinal arteriovenous shunts (ID-SAVSs) have considered their anatomical localization in relation to their phenotype and angioarchitectonics. The authors propose another vision of ID-SAVSs allowing a reappraised classification based on analysis of the anatomical disposition, angioarchitecture, and histogenetic location of these vascular malformations. METHODS The radiological and clinical records of 210 patients with ID-SAVSs were retrospectively reviewed, considering their localization, vascular architectonics, and correlation with the 5 histogenetic units of the spinal cord. Among these, 183 files with complete data allowed precise analysis of the ID-SAVSs. RESULTS Among these 183 files (162 and 21 cases with single and multiple lesions, respectively), different entities were identified: 13 pial macro arteriovenous fistulas (MAVFs), 92 pial micro arteriovenous fistulas (mAVFs), 33 superficial pial niduses, and 69 intramedullary niduses. Thirteen sulcal shunts (either fistulas or niduses) were considered subtypes of pial lesions. Among the 21 multiple cases, 11 were monomyelomeric while 10 were multimyelomeric. Pial lesions, either fistulas or niduses, were dominantly vascularized by pial arteries (anterior or posterior depending on the localization of the shunt) and occasionally (except for MAVFs) by transmedullary arteries. Pial niduses occasionally extended into the funiculus by recruiting intrinsic veins or by extension of the nidus itself inside the white matter. Intramedullary niduses were always vascularized by both centrifugal and centripetal feeders, respectively, from sulcal arteries (SAs) and pial arteries. Sulcal lesions are pial lesions located within the ventral median sulcus and vascularized by SAs and veins. Single or multiple ID-SAVSs can be part of various syndromes such as hereditary hemorrhagic telangiectasia, Parkes-Weber, RASA1, CLOVES, and spinal arteriovenous metameric syndromes. Histogenetic analyses revealed a specific distribution of each ID-SAVS in the 5 histogenetic units of the spinal cord: intramedullary niduses were found almost equally from cervical to thoracic units, while MAVFs and mAVFs were mostly found from thoracic to postcrural ones. Pial niduses showed intermediate features between intramedullary and fistulous lesions and were mostly distributed from brachial to crural segments. CONCLUSIONS Precise analysis of the anatomical disposition of ID-SAVSs in relation to functional histogenetic units allows a better understanding of these lesions and improved therapeutic management.

scholarly journals Interpositional dural graft technique for the treatment of dural arteriovenous fistulas

2007 ◽  
Vol 22 (3) ◽  
pp. 1-4 ◽  
Author(s):  
Michael Finn ◽  
Paul Klimo ◽  
William T. Couldwell
Keyword(s):  
Treatment Options ◽  
Venous Drainage ◽  
Venous Sinus ◽  
Illustrative Case ◽  
Pial Surface ◽  
Arteriovenous Fistulas ◽  
Arteriovenous Shunts ◽  
Dural Graft ◽  
Dural Arteriovenous Fistulas ◽  
Dural Venous Sinus

✓Dural arteriovenous fistulas (dAVFs) are acquired direct arteriovenous shunts that often drain into the dural venous sinus. Treatment options generally involve disrupting the abnormal vascular conduits by using a combination of modalities, including surgical disconnection, radiosurgery, and transarterial and transvenous embolization. Often these modalities provide only partial treatment of fistulous lesions, and thus the fistula recurs and symptoms result. The authors report on a novel surgical technique in which the involved venous sinuses are skeletonized and an interpositional dural substitute is placed between the disconnected sinus and native dura mater and over the pial surface adjacent to the sinus. The technique, which is demonstrated in an illustrative case, is intended to preserve native venous drainage and to prevent recruitment of new vascularization to the venous sinus postoperatively. The authors have not observed reconstitution of fistulas over areas treated with this technique, which offers the advantage of inhibiting vascular ingrowth (refistulization) while maintaining venous sinus patency.

scholarly journals Spinal Dural Arteriovenous Fistulas (FAVDR) with Peri- Medullary Venous Drainage: Clinical, Radiological and Therapeutic Aspects (Case Report and Literature Review)

2021 ◽  
Vol 3 (5) ◽  
pp. 32-33
Author(s):  
Tarek Mesbahi ◽  
Abderrahmane Rafiq ◽  
Nidal Amara ◽  
Marouane Makhchoune ◽  
Abdelhakim Lakhdar
Keyword(s):  
Spinal Cord ◽  
Case Report ◽  
Clinical Picture ◽  
Standard Treatment ◽  
Venous Drainage ◽  
Cord Compression ◽  
Arteriovenous Fistulas ◽  
Dural Arteriovenous Fistulas ◽  
Chronic Myelopathy ◽  
Spinal Dural Arteriovenous Fistulas

Spinal dural arteriovenous fistulas are rare and often unrecognized,  they occur predominantly in men, with an initial clinical picture most often  misleading made of chronic myelopathy in the absence of treatment, the evolution is slowly towards a definitive paraplegia. We report the case of a patient referred for a table of spinal cord compression revealing a spinal dural fistula with perimedullary venous drainage treated urgently, due to the worsening of the clinical picture. The standard treatment consists of surgical or endovascular exclusion of the fistula (in our case the fistula was surgically excluded). From this case and based on the literature, we will specify the a, clinical, radiological characteristics as well as the prognosis of these malformations, and we will discuss the possibilities of therapeutic management.

Three-dimensional angioarchitecture of spinal dural arteriovenous fistulas, with special reference to the intradural retrograde venous drainage system

2013 ◽  
Vol 18 (4) ◽  
pp. 398-408 ◽  
Author(s):  
Keisuke Takai ◽  
Taichi Kin ◽  
Hiroshi Oyama ◽  
Masaaki Shojima ◽  
Nobuhito Saito
Keyword(s):  
Spinal Cord ◽  
Dura Mater ◽  
Drainage System ◽  
Venous Drainage ◽  
Conus Medullaris ◽  
University Hospital ◽  
Arteriovenous Fistulas ◽  
Dural Arteriovenous Fistulas ◽  
Artery Of Adamkiewicz ◽  
Spinal Dural Arteriovenous Fistulas

Object There have been significant advances in understanding the angioarchitecture of spinal dural arteriovenous fistulas (AVFs). However, the major intradural retrograde venous drainage system has not been investigated in detail, including the most proximal sites of intradural radiculomedullary veins as they connect to the dura mater, which are the final targets of interruption in both microsurgical and endovascular treatments. Methods Between April 1984 and March 2011, 27 patients with 28 AVFs were treated for spinal dural AVFs at the authors' university hospital. The authors assessed vertebral levels of feeding arteries and dural AVFs by using conventional digital subtraction angiography. They also assessed 3D locations of the most proximal sites of intradural radiculomedullary veins and the 3D positional relationship between the major intradural retrograde venous drainage system and intradural neural structures, including the spinal cord, spinal nerves, and the artery of Adamkiewicz, by using operative video recordings plus 3D rotational angiography and/or 3D computer graphics. In addition, they statistically assessed the clinical results of 27 cases. Of these lesions, 23 were treated with open microsurgery and the rest were treated with endovascular methods. Results Feeding arteries consisted of T2–10 intercostal arteries with 19 lesions, T-12 subcostal arteries with 3 lesions, and L1–3 lumbar arteries with 6 lesions. The 3D locations of the targets of interruption (the most proximal sites of intradural radiculomedullary veins as they connect to the dura mater) were identified at the dorsolateral portion of the dura mater adjacent to dorsal roots in all 19 thoracic lesions, whereas they were identified at the ventrolateral portion of the dura mater adjacent to ventral roots in 7 (78%) of 9 cases of conus medullaris/lumbar lesions (p < 0.001). The major intradural retrograde venous drainage system was located dorsal to the spinal cord in all 19 thoracic lesions, whereas it was located ventral to the spinal cord in 4 (44%) of 9 cases of conus/lumbar lesions (p = 0.006). In 3 (11%) of 27 cases, AVFs had a common origin of the artery of Adamkiewicz. In 2 lumbar lesions, the artery of Adamkiewicz ascended very close to the vein because of its ventral location. Although all lesions were successfully obliterated without major complications and both gait and micturition status significantly improved (p = 0.005 and p = 0.015, respectively), conus/lumbar lesions needed careful differential diagnosis from ventral intradural perimedullary AVFs, because the ventral location of these lesions contradicted the Spetzler classification system. Conclusions The angioarchitecture of spinal dural AVFs in the thoracic region is strikingly different from that in conus/lumbar regions with regard to the intradural retrograde venous drainage system. One should keep in mind that spinal dural AVFs are not always dorsal types, especially in conus/lumbar regions.

Ophthalmic vein compression for selected benign low-flow cavernous sinus dural arteriovenous fistulas

2013 ◽  
Vol 119 (1) ◽  
pp. 239-242 ◽  
Author(s):  
Juan Pablo Cruz ◽  
Rene van Dijk ◽  
Timo Krings ◽  
Ronit Agid
Keyword(s):  
Cavernous Sinus ◽  
Carotid Arteries ◽  
Low Flow ◽  
External Carotid ◽  
Manual Compression ◽  
Venous Reflux ◽  
Arteriovenous Fistulas ◽  
Arteriovenous Shunts ◽  
Dural Arteriovenous Fistulas ◽  
Cortical Venous Reflux

Dural arteriovenous fistulas (DAVFs) of the cavernous sinus are acquired arteriovenous shunts between the dural branches of the internal and external carotid arteries and the cavernous sinus. These fistulas may present with cortical venous reflux, but more commonly drain antegradely toward the superior ophthalmic vein (SOV). Transvenous embolization is the most common endovascular treatment, but in some cases transvenous access to the compartment of the shunt may not be possible. In cases with no corticovenous reflux, manual compression of the SOV is an excellent alternative treatment, which is well known but rarely reported in the literature. The authors describe a series of 3 cavernous DAVFs with anterior drainage treated successfully by intermittent manual compression of the SOV.

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