“…PA are difficult to detect before the development of massive hemorrhage due to the absence or mildness of the previous symptoms. For this reason, graft control with doppler ultrasonography in the follow up should be performed[ 35 ]. Once PA is suspected or demonstrated at ultrasonography, the full anatomy of the PA is best displayed with volumetric high-spatial-resolution CT scanning (angio-CT) or magnetic resonance angiography[ 14 ].…”