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. 2023 Feb 3;13:1996. doi: 10.1038/s41598-023-29295-4

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© The Author(s) 2023

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Diagrammatic representation of all vascular variants on the axial and sagittal plane. JB jugular bulb, ICA internal carotid artery, ME middle-ear, SS sigmoid sinus. (a) HJB- blue arrow showing the bulb rising to the sigmoid plate; (b) JBD- red dotted circle showing absence of sigmoid plate due to descent of JB into the middle ear; (c) FJB- absence of the dome (rising bulb), blue arrow showing SS continue into the internal jugular vein; and (d) ICA-Deh: blue arrow showing focal dehiscence of the carotid canal into the middle ear.