Spinal arteriovenous malformations
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Spinal arteriovenous malformations (AVMs) are characterised by arteriovenous shunting with a true nidus. They represent ~25% of spinal vascular malformations.
Epidemiology
Different types of spinal AVM (see below) have differing age of presentation, but overall 80% present between the age 20 and 60 years 3.
Clinical presentation
It is variable, ranging from the progressive myelopathy (Foix-Alajouanine syndrome), often with delayed diagnosis, to the catastrophic spinal subarachnoid haemorrhage (see: coup de poignard of Michon 3).
Pathology
Classification
Spinal AVMs may be classified as intramedullary and extramedullary (80%) 1 and further divided into 4four angiographic types, with additional sub typessubtypes 2-3 (see: spinal AVM classification).
Complications
- myelopathy from venous congestion/hypertension
- haemorrhage: within the cord parenchyma or subarachnoid space 6
- high-flow AVMs may cause arterial steal from adjacent spinal cord segments 6
- myelopathy from large AVMs (rare) 6
Radiographic features
DSA: angiogrpahy angiography
Angiography remains the investigation of choice, but requires meticulous technique. It is essential to remember that the site of arterial supply can be anywhere from the upper thoracic to sacral areas with little relationship to the clinical level, or visible nidus (if present).
MRI
Signal characteristics
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T1
-
signal voids from high
velocity-velocity flow - dilated perimedullary vessels indent/scallop the cord 1
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signal voids from high
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T2
- signal voids from high
velocity-velocity flow 1 - increased cord signal due to cytotoxic oedema or myelomalacia 1
- signal voids from high
Treatment and prognosis
Both surgery and angio-embolisationangioembolisation have a role in the treatment of spinal AVMs 6.
-<p><strong>Spinal arteriovenous malformations (AVMs)</strong> are characterised by arteriovenous shunting with a true nidus. They represent ~25% of <a href="/articles/spinal-vascular-malformations">spinal vascular malformations</a>. </p><h4>Epidemiology</h4><p>Different types of spinal AVM (see below) have differing age of presentation, but overall 80% present between the age 20 and 60 years <sup>3</sup>. </p><h4>Clinical presentation</h4><p>It is variable, ranging from the progressive myelopathy (<a href="/articles/foix-alajouanine-syndrome">Foix-Alajouanine syndrome</a>), often with delayed diagnosis, to the catastrophic spinal <a href="/articles/subarachnoid-haemorrhage">subarachnoid haemorrhage</a> (see: <a href="/articles/coup-de-poignard-of-michon">coup de poignard of Michon</a> <sup>3</sup>).</p><h4>Pathology</h4><h5>Classification</h5><p>Spinal AVMs may be classified as intramedullary and extramedullary (80%) <sup>1</sup> and further divided into 4 angiographic types, with additional sub types <sup>2-3</sup> (see: <a href="/articles/spinal-avm-classification">spinal AVM classification</a>).</p><h5>Complications</h5><ul>- +<p><strong>Spinal arteriovenous malformations (AVMs)</strong> are characterised by arteriovenous shunting with a true nidus. They represent ~25% of <a href="/articles/spinal-vascular-malformations">spinal vascular malformations</a>. </p><h4>Epidemiology</h4><p>Different types of spinal AVM (see below) have differing age of presentation, but overall 80% present between the age 20 and 60 years <sup>3</sup>. </p><h4>Clinical presentation</h4><p>It is variable, ranging from the progressive myelopathy (<a href="/articles/foix-alajouanine-syndrome">Foix-Alajouanine syndrome</a>), often with delayed diagnosis, to the catastrophic spinal <a href="/articles/subarachnoid-haemorrhage">subarachnoid haemorrhage</a> (see: <a href="/articles/coup-de-poignard-of-michon">coup de poignard of Michon</a> <sup>3</sup>).</p><h4>Pathology</h4><h5>Classification</h5><p>Spinal AVMs may be classified as intramedullary and extramedullary (80%) <sup>1</sup> and further divided into four angiographic types, with additional subtypes <sup>2-3</sup> (see: <a href="/articles/spinal-avm-classification">spinal AVM classification</a>).</p><h5>Complications</h5><ul>
-</ul><h4>Radiographic features</h4><h5>DSA: angiogrpahy</h5><p>Angiography remains the investigation of choice, but requires meticulous technique. It is essential to remember that the site of arterial supply can be anywhere from the upper thoracic to sacral areas with little relationship to the clinical level, or visible nidus (if present).</p><h5>MRI</h5><h6>Signal characteristics</h6><ul>- +</ul><h4>Radiographic features</h4><h5>DSA: angiography</h5><p>Angiography remains the investigation of choice but requires meticulous technique. It is essential to remember that the site of arterial supply can be anywhere from the upper thoracic to sacral areas with little relationship to the clinical level, or visible nidus (if present).</p><h5>MRI</h5><h6>Signal characteristics</h6><ul>
-<a href="/articles/flow-void">signal voids</a> from high velocity flow</li>- +<a href="/articles/flow-void">signal voids</a> from high-velocity flow</li>
-<li>signal voids from high velocity flow <sup>1</sup>- +<li>signal voids from high-velocity flow <sup>1</sup>
-</ul><h4>Treatment and prognosis</h4><p>Both surgery and angio-embolisation have a role in the treatment of spinal AVMs <sup>6</sup>.</p>- +</ul><h4>Treatment and prognosis</h4><p>Both surgery and angioembolisation have a role in the treatment of spinal AVMs <sup>6</sup>.</p>
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