Volume 33, Issue 1 pp. 102-108
CLINICAL INVESTIGATIVE STUDY

High-resolution MRI to noninvasively characterize drainage around the carotid artery into the cervical lymph nodes

Zafer Keser

Zafer Keser

Department of Neurology, Mayo Clinic, Rochester, Minnesota, USA

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Garrett Smith

Garrett Smith

Department of Radiology, College of Medicine, University of Florida, Gainesville, Florida, USA

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Emin Cagil

Emin Cagil

Department of Neurosurgery, Ankara Numune Training and Research Hospital, Ankara, Turkey

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Fatih Tufan

Fatih Tufan

Geriatrician (PP), Silivrikapi Mh. Hisaralti Cd, Istanbul, Turkey

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Onder Albayram

Onder Albayram

Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, South Carolina, USA

Department of Neuroscience, Medical University of South Carolina, Charleston, South Carolina, USA

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Mehmet Sait Albayram

Corresponding Author

Mehmet Sait Albayram

Department of Radiology, College of Medicine, University of Florida, Gainesville, Florida, USA

Correspondence

Mehmet Sait Albayram, Department of Radiology, College of Medicine, University of Florida, PO Box 100374, Gainesville, FL 32610, USA.

Email: [email protected]

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First published: 02 October 2022
Citations: 1

Abstract

Background and Purpose

Previous studies have proposed multiple parallel channels for waste clearance from the brain, though many gaps remain in our understanding of these systems. In this study, we examined periarterial fluid drainage around intracranial and extracranial segments of the internal carotid arteries (ICAs) from the brain into the cervical lymph nodes using a noninvasive and clinical-based method.

Methods

Eighty-one subjects (45 females, aged 15-80 years old) with nonlesioned epilepsy underwent high-resolution 3-dimensional T2-weighted fluid-attenuated inversion recovery (FLAIR) MRI. We utilized a noninvasive and clinical-based method with a manual semiautomated approach to characterize the periarterial lymphatic system's maximum thickness and signal intensities along the ICAs using high-resolution 3-dimensional FLAIR imaging. We conducted group comparisons and correlation analyses to investigate sex- and age-based trends. Results were corrected with Bonferroni's test for multiple comparisons, and we performed power analysis for sample size calculations.

Results

Using high-resolution FLAIR images, we show evidence that fluid drainage emerges around the ICA petrous segment and joins lymphatic flow from cranial nerves in the upper neck, with this flow ultimately draining into the cervical lymph nodes bilaterally. Lymphatic signal at the petrous segment level was significantly thinner in females compared to males bilaterally (w = 413, p = .0001 on the right, w = 356, p < .0001 on the left). Lymphatic drainage around the petrous segments of the ICAs bilaterally was thicker with age in males but not in females.

Conclusions

We describe the in vivo high-resolution imaging characteristics of periarterial fluid drainage along the vessel walls of ICAs. This represents a potentially major channel for brain waste clearance. We also report interesting sex- and age-based trends in these structures within our cohort.

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