Bilateral oblique occipital venous sinus groove and asymmetry of the sigmoid sinus groove: A case report. Research, Society and Development, [S. l.], v. 15, n. 1, p. e6715150557, 2026. DOI: 10.33448/rsd-v15i1.50557. Disponível em: https://rsdjournal.org/rsd/article/view/50557. Acesso em: 3 feb. 2026.