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Menon, B.K., Singh, J., Al-Khataami, A. et al. The donut sign on CT angiography: an indicator of reversible intraluminal carotid thrombus?. Neuroradiology 52, 1055–1056 (2010). https://doi.org/10.1007/s00234-010-0738-x
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DOI: https://doi.org/10.1007/s00234-010-0738-x