When Collaterals Become the Outflow: A Functioning Arteriovenous Fistula Despite Brachiocephalic Vein Occlusion. Portuguese Kidney Journal, [S. l.], 2026. DOI: 10.71749/pkj.184. Disponível em: https://pkj.spnefro.pt/index.php/journal/article/view/184.. Acesso em: 4 nov. 2026.