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Pattern of communication at the confluence of the sinuses and examples of the classification based on number of internal groove findings. A: Left dominant pattern with two findings (Type II). B: Bifurcation pattern with four findings (Type IV). C: Right dominant pattern with one finding (Type I). D: Confluence pattern with one finding (Type I). OF: Occipital foramen; MF: Mastoid foramen; GF: Granular Foveolae; ATS: Absent Transverse Sinus Groove
