MRA can be used to diagnose DVT in cases where CDU provides inconclusive results.36,45 The accuracy is similar to that of CDU in the diagnosis of DVT of the iliocaval segment.42,46 MRA with direct thrombus imaging, based on the paramagnetic properties of methemoglobin, may be the imaging modality of choice for suspected acute recurrent DVT, distinguishing between an old and a new event.36 This evidence concerns the gene HBG2 and deep vein thrombosis.