Fig. 1

a Antegrade diagnostic venogram in left AVF showing tight stenosis at the terminal arch. b Angioplasty at the terminal arch using 8 mm × 4 cm balloon. c Post-angioplasty venogram showing no significant residual stenosis at the terminal arch. d Antegrade diagnostic venogram in Left AVF after 5 months showing recurrent tight stenosis at the terminal arch. e Angioplasty at the terminal arch using 8 mm × 4 cm balloon. f Post-angioplasty venogram showing no significant residual stenosis at the terminal arch