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Our goal was to demonstrate the spectrum of neuroradiologic(CT,MR,and angiographic)findings in craniocervical arterial dissection(CAD)related to exercise or sporting activities and compare the diagnostic utility of CT, MRI and MR angiography(MRA).Computed tomography demonstrated infarction in four patients.At contrast angiography,a dissection was found in the artery supplying the region of infarction in all cases.A hyperdense artery was found by CT in two patients,which correlated with dissection of the artery or its parent artery on contrast angiography.Cranial MRI findings were seen in six patients(infarction in five,periarterial signal abnormality in five).Dissection was confirmed in all four patients with abnormal periarterial signal who underwent contrast angiography.Two patients with abnormal intracranial periarterial signal had corresponding abnormalities on MRA.False-negative cranial and cervical MRI and MRA studies were performed in one patient because the imaging volumes used for the cervical and intracranial MR examinations did not overlap.Four patients with normal intracranial arterial signal had dissection in the neck demonstrated by contrast angiography.Neuroradiologic findings of CAD can include infarction,a hyperdense artery on CT,abnormal periarterial signal on MRI, and a narrowed arterial signal column on MRA.Computed tomography is an insensitive screening examination.Proper use of MRI and MRA involves examination of both the head and the neck with overlapping imaging volumes of the two regions. |
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arterial dissection arterial dissection,carotid arterial dissection,intracranial arterial dissection,vertebral basilar artery carotid angiogram CAT scan CAT scan,abnormal CAT scan,dense artery sign CAT scan,false negative cerebrovascular accident dense basilar artery sign exercise headache misdiagnosis MRI MRI,abnormal MRI,angiography MRI,angiography,false negative MRI,flow void,blood neck pain sports medicine,neurology of vertebral artery
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