Subclinical AP fistulas can be seen incidentally on angiography of transplanted livers; however, the prevalence of symptomatic fistulas is rare (0.2%)
Symptomatic AP fistulas most commonly manifest with hemobilia, gastrointestinal hemorrhage, elevated liver function tests, and abdominal pain.
Saad WE, Lippert AJ, Davies MG, et al. Prevalence, presentation and endovascular management of hemodynamically or clinically significant arterio-portal fistulae in living and cadaveric-donor liver transplant recipi- ents. Clin Transplant 2012; 26:451–459.
Saad WE. Arterioportal fistulas in liver transplant recipients. Semin Intervent Radiol 2012; 29:105–110.