Dedicated neuroimaging in children with primary headache: prevalence of lesions and comparison between migraine and non-migraine

Purpose: This study evaluated the prevalence and types of intracranial lesions through dedicated imaging analysis of primary headaches in children and compared them between migraine and non-migraine patients. Methods This study included 190 children diagnosed with primary headache who underwent neuroimaging, including brain computed tomography (CT), CT angiography (CTA), and brain magnetic resonance imaging (MRI). Patients were divided into two groups based on data from electronic medical records. Clinical characteristics and imaging findings were evaluated and compared between the two groups. Results Migraine patients were old and had a longer period from symptom onset to diagnosis. CT was normal in 71 of 95 patients, whereas 7 of 29 patients who underwent CTA had vascular lesions; the migraine group (n = 6/20, 30%) had higher incidence of vascular lesions than the non-migraine group (n = 1/9, 11.1%); however, there was no statistically significant difference (p = 0.382). Furthermore, 57.5% (61/106) of children showed normal brain MRI. The most common brain MRI finding was dilated perivascular space (n = 18, 16.8%). Most perivascular spaces were located in the basal ganglia (n = 72, 75.8%) and were in linear patterns (n = 58, 63.0%). There was no statistically significant difference between the two groups. Conclusion Low prevalence of significant abnormalities was found in children with primary headaches. Dilated perivascular space was the most common finding in both groups on MRI. CTA showed more vascular lesions in the migraine group than in the non-migraine group. Therefore, further evaluations are needed to reveal the relationship between vascular lesions or dilated perivascular space and pediatric primary headaches.