Single-dose three-dimensional dynamic contrast-enhanced MR angiography of soft-tissue hemangioma of limbs / 中华放射学杂志

ABSTRACT

Objective To investigate the feasibility and role of single-dose three-dimensional dynamic contrast-enhanced magnetic resonance angiography(SD 3D DCEMRA)in evaluating soft-tissue hemangioma of limbs.Methods The transit time(TT),signal intensity of peak enhancement(SPE)and duration of peak enhancement(DPE)of the femoral,popliteal and anterior tibial arteries at the level of the middle section were assessed in 30 healthy volunteers after intravenous bolus injection of single-dose contrast media at the rate of 3 ml/s.Forty-five patients with soft-tissue hemangioma and 9 patients with schwannoma of the extremities underwent both conventional MRI and SD 3D DCEMRA.The acquisition time of SD 3D DCEMRA ranged from 10 to 12 s,and early arterial,late arterial and venous phases of SD 3D DCEMRA images were acquired consecutively.The conventional MRI and SD 3D DCEMRA findings of the 45 patients with hemangioma were observed and compared with those of the 9 cases of sehwannoma.Results(1)The TT,SPE and DPE of the femoral,poplitcal and anterior tibial arteries were(15?5)s,(400?50),(11.9? 2.6)s;(19?7)s,(320?45),(16.8?3.6)s and(27?10)s,(270?39),(22.0?6.6)s respectively. The comparison of TT(F=6.91,P0.01).The tumoral feeding artery was visualized in all cases(100%).(3)Two cases of hemangioma missed on conventional MRI were correctly diagnosed on SD 3D DCEMRA owing to the visualization of both the tumoral mass and the feeding artery.(4)For schwannoma,neither the dynamic visualization of tumoral mass nor the feeding artery was demonstrated on SD 3D DCEMRA.Conclusion SD 3D DCEMRA is technically feasible to evaluate the limb soft-tissue hemangioma.Dynamic visualization of tumoral mass and demonstration of the tumoral feeding artery are the characteristic features of the tumor on SD 3D DCEMRA.