arteriovenous malformation associated with
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Here is a comprehensive overview of conditions and findings associated with arteriovenous malformations (AVMs), drawn from multiple authoritative sources:
Arteriovenous Malformation (AVM) — Associated Conditions & Features
Pathobiology
An AVM consists of dysplastic vessels fed by arteries and drained by veins without an intervening capillary network (nidus of shunting arterioles and venous loops). The low-resistance, high-flow shunt causes progressive arterial and venous dilatation. In >60% of cases, an activating KRAS mutation is pathogenic. — Goldman-Cecil Medicine
Associated Syndromes & Genetic Conditions
| Condition | Key Feature |
|---|---|
| Hereditary Hemorrhagic Telangiectasia (HHT) / Osler-Weber-Rendu disease | Autosomal dominant; mutations in ENG (endoglin) or ALK1 (ACVRL1); pulmonary, cerebral, hepatic, and GI AVMs; epistaxis and GI bleeding |
| Wyburn-Mason (Mason-Wyburn) syndrome | Retinal AVM + ipsilateral intracranial AVM; facial vascular nevi |
| Sturge-Weber syndrome | Port-wine stain + leptomeningeal venous angioma; associated CNS vascular malformations |
| Capillary Malformation-AVM syndrome (CM-AVM1) | Autosomal dominant; RASA1 mutation; multifocal CMs + high-risk AVMs in brain and spine; "thumbprint" oval CMs |
| CM-AVM2 | EPHB4 (EPHRIN B4) mutation; similar phenotype but lower risk of CNS AVMs |
| Klippel-Trénaunay syndrome | Port-wine stain + soft tissue/bony hypertrophy + varicosities; associated vascular malformations |
| Louis-Bar (Ataxia-Telangiectasia) syndrome | Telangiectasias + cerebellar ataxia + immunodeficiency |
| Cobb syndrome | Cutaneous vascular malformation in a dermatome + spinal AVM at same segment; may be due to RASA1 or EPHB4 mutations |
| RASopathies | RASA1 is part of the RAS-MAPK pathway (shared with Noonan, Costello, neurofibromatosis type 1, Legius syndrome) |
— Bradley and Daroff's Neurology; Andrews' Diseases of the Skin; K.J. Lee's Essential Otolaryngology
Associated Clinical Presentations
| Manifestation | Notes |
|---|---|
| Intracranial hemorrhage | ~50% of symptomatic AVMs; can be subarachnoid, intracerebral, or intraventricular |
| Seizures | ~30%; typically focal |
| Progressive neurologic deficits | ~20%; due to steal phenomenon reducing perfusion to normal brain |
| Headache | Common presenting symptom; may prompt incidental discovery on imaging |
| Subarachnoid hemorrhage | From aneurysm in the feeding artery; AVM is a less common cause of SAH than saccular aneurysm |
| Associated aneurysms | Increased flow through feeding arteries promotes aneurysm formation within the nidus |
— Goldman-Cecil Medicine; Harrison's Principles of Internal Medicine
Associated Structural Features
- Multiple AVMs (2%): strongly associated with Osler-Weber-Rendu or Wyburn-Mason syndrome (98% are solitary)
- Dural arteriovenous fistulas (DAVF): a related but distinct entity; classified by Borden system; hemorrhage carries ~30% mortality
- Cavernous malformations / cavernous angiomas: may co-exist; can be familial (with CCM1/2/3 mutations)
- Venous angiomas (developmental venous anomalies): occasionally co-located with AVMs
Site-Specific AVMs and Associations
| Location | Associated Finding |
|---|---|
| Pulmonary AVM | Strongly associated with HHT; can cause hemoptysis, hemothorax, paradoxical embolism; may enlarge during pregnancy |
| Spinal AVM | Associated with cord oedema, haemosiderosis; may present with myelopathy |
| Renal AVM | Can cause hematuria; may be congenital or acquired |
| Uterine AVM | Associated with abnormal uterine bleeding; may be congenital or post-traumatic/post-curettage |
| GI AVMs | Common cause of lower GI bleeding alongside diverticulosis |
| Retinal AVM | Wyburn-Mason syndrome |
Spetzler-Martin Grading (Surgical Risk)
| Parameter | Points |
|---|---|
| Size: <3 cm | 1 |
| Size: 3–6 cm | 2 |
| Size: >6 cm | 3 |
| Eloquent location | +1 |
| Deep venous drainage | +1 |
Higher score = higher surgical morbidity. Treatment options: microsurgical resection, endovascular embolization, or stereotactic radiosurgery (for small lesions). — K.J. Lee's Essential Otolaryngology
In summary, AVMs are associated with: syndromic conditions (HHT, Sturge-Weber, Wyburn-Mason, CM-AVM, Klippel-Trénaunay), somatic/germline KRAS or RASA1/EPHB4 mutations, intracranial hemorrhage, seizures, neurologic deficits, feeding artery aneurysms, and site-specific complications depending on location (pulmonary, spinal, GI, renal, uterine).
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