Twenty-nine patients with significant haematuria after a renal invasiv
e procedure (27 of whom had undergone a percutaneous renal procedure a
nd 2 surgical pyelolithotomy) were investigated with angiography, Out
of the 21 patients with evidence of arterial injury, 19 were treated b
y transarterial embolization with gelfoam with or with hydrogel partic
les; (n = 11), steel coils with gelfoam (n = 4), hydrogel particles (n
= 1), surgicel (n = 2), silk with gelfoam (n = 1). The efficacy and t
echnique of the therapeutic embolization procedure is emphasized.