When a Fistula Becomes a Headache: Cerebral Venous Drainage Due to Central Venous Occlusion. Portuguese Kidney Journal, [S. l.], 2026. DOI: 10.71749/pkj.177. Disponível em: https://pkj.spnefro.pt/index.php/journal/article/view/177.. Acesso em: 6 nov. 2026.