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. 2020 Oct 20;63(3):417–430. doi: 10.1007/s00234-020-02564-z

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — Case “AHT4”. 5 month-old. 1A: FLAIR ax, 1B:T2* ax. • Anamnesis (not available for the neuro/radiologists): Rule out hydrocephalus by macrocephaly. • MRI findings: Bilateral inhomogeneous SDH, rupture of the cortical veins (curved arrows) and retinal bleeding (straight arrow). No parenchymal injury. Extra-axial blood clots with a tubular shape in the high convexity (curved arrows) are suggestive of an acute bridging vein thrombosis and are known as “lollipop-” and “tadpole- sign” (bridging veins that terminate abruptly). • All experienced neuroradiologists correctly assumed a pAHT. Two neuroradiologists recognized the retinal hemorrhage, another neuroradiologist suspected it. • 2 out of 3 non-neuroradiologists correctly assumed an pAHT. No non-neuroradiologist recognized or suspected the retinal hemorrhage.