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Neurology India, Vol. 54, No. 1, January-March, 2006, pp. 81-82 Case Report Post-traumatic dissecting aneurysms of bilateral cervical carotid arteries with delayed complications Kanodia AvinashKumar, Gupta Meena, Bala Kiran, Kumar Sunil, Kushwaha Suman, Pandey Sanjay Departments of Neuroradiology, Institute of Human Behaviour and Allied Sciences, Dilshad Garden, Delhi - 110095 Code Number: ni06022 Abstract Carotid dissection is an uncommon complication of trauma. They can present with immediate or delayed complications. We describe the case of a young patient with bilateral carotid dissections and acute infarcts. Brief review of literature and treatment options are discussed.Keywords: Dissection, trauma, infarct Dissection of cervical internal carotid arteries (ICA) is an unusual complication of trauma. Bilateral dissections and dissecting aneurysms are extremely rare.[1] The patient may be symptomatic immediately after trauma, or less commonly, after a gap of weeks, months or years.[2] A 20-year-old man developed sudden-onset right hemiparesis and aphasia, minutes after a gymnasium workout. MRI revealed multiple acute infarcts in left frontoparietal and small infarcts in right frontal lobe [Figure - 1]. Patient improved within 5 days of the acute event. He gave history of road traffic accident just over a year back, in which he had suffered head injury and was unconscious for 7-8 hours. Since then, he had been asymptomatic. Digital subtraction angiography (DSA) revealed dissecting aneurysms in bilateral cervical ICAs, just proximal to the skull base. On right side, there was no stasis in the aneurysm and no narrowing of the vascular lumen [Figure - 2]. On left side, the aneurysm neck was narrow and there was considerable stasis of the contrast, with narrowing of the lumen of the vessel by 30% [Figure - 3]. Arterial dissection may lead to stenosis, vascular occlusion or sometimes, pseudoanerysm formation. Usual etiologies include trauma, arteritis, iatrogenic (including post-surgical), spontaneous and infections. The cervical ICA just proximal to the skull base is a site of predisposition in trauma. Most commonly, they present as neurological deficits or transient ischaemic attacks (TIA). Other presentations include neck pain, compression of cranial nerves, pulsatile neck masses, rupture and Horner′s syndrome. Sometimes, they present later with ischaemic symptoms varying from weeks to years; upto 6 year interval has been reported,[2] with devastating consequences.[3] The late embolic event may be precipitated by minor trauma or a sudden neck movement, that might dislodge a thrombus. In the present case, the symptoms occurred immediately after the patient had a gymnasium workout. Although the possibility of dissection at the time of gymnasium workout is present, it is less likely, as the patient did not experience any pain at that time. The diagnosis is usually confirmed by CT or MR angiography, although DSA is the gold standard, particularly for the haemodynamic assessment. In the present case, there was considerable stasis of contrast on the symptomatic left side, which predisposes to thromboembolism. Antiplatelet and/or anticoagulant therapy has been advocated as effective treatment in carotid dissections,[4] but healing of pseudoaneurysms is quite rare with medical treatment alone.[3] Surgery is hampered by difficult approach to distal cervical ICA.[5] Covered stent grafting is increasingly being performed for treating such patients with good results,[6] although the long-term patency rate of covered stents is not known. In conclusion, bilateral dissecting aneurysms of distal cervical ICAs are extremely rare, and may have late complications. Early detection by keeping a high index of suspicion is required to prevent delayed complications, which could be devastating. References
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