Objective To observe conventional MRI features of soft tissue hemangioma of limb, and to assess the value of 3D high temporal resolution MR imaging subtraction angiography (3D-HR-MRISA) in diagnosis of this disease. Methods All 18 patients with hemangioma underwent plain and post-contrast enhanced routine MRI and 3D-HR-MRISA with a 3. 0T MR, then the demonstration of feeding arteries and draining veins were observed. The abilities of every sequence on the hemangioma were assessed with 4 scales (0—3). Results There were 16 cases of solitary hemangioma and 2 cases of 2 he-mangiomas, totally 20 hemangiomas. The feeding arteries of 17 hemangiomas were found, and draining veins of 13 heman-giomas were detected by 3D-HR-MRISA. The sum of average score for T2WI fat-suppression (Spair) was 2. 78±0. 44, higher than that of T1WI (1. 67 ±1. 00, P=0.013), T2W1 (2. 33± 0. 50, P = O.O35) and the temporal basic imaging (1. 89 + 0. 60, P = 0. 009), but there was no statistical difference with T1WI fat-suppression enhanced imaging (2. 33 + 0. 71, P = 0. 169). The average score for temporal basic imaging was lower than that of T1WI fat-suppression enhanced imaging (P=0. 035). Conclusion 3D-HR-MRISA could initially assess the hemodynamics of hemangioma, while the effect of conventional MR sequence on the spectrum of hemangioma is irreplaceable.%目的 探讨四肢软组织血管瘤的常规MRI表现,评价三维高时间分辨率磁共振血管减影成像(3D-HR-MRI-SA)诊断该病的价值.方法 对18例临床证实的四肢软组织血管瘤患者,采用3.0T MR机行常规MR平扫和增强扫描以及3D-HR-MRISA,观察3D-HR-MRISA显示供血动脉和引流静脉的能力.以4分法(0～3分)评价各序列对瘤灶的辨认能力.结果 18例中,16例单发,2例多发,共20个病灶.17个瘤灶可见供血动脉,13个瘤灶可见引流静脉.脂肪抑制T2WI辨认瘤灶范围的累积评分(2.78±0.44)优于T1WI(1.67±1.00,P=0.013)、T2WI(2.33士0.50,P=0.035)及3D-HR-MRISA原始图像(1.89±0.60,P=0.009),与脂肪抑制增强T1WI差异无统计学意义(2.33士0.71,P=0.169),而脂肪抑制增强T1WI辨认瘤灶范围的能力优于3D-HR-MRISA原始图像(P=0.035).结论 3D-HR-MRISA可初步评估血管瘤的血流动力学状态,有利于临床制定诊疗方案,但在显示瘤灶范围及其与周围结构的关系方面不可替代常规序列MRI.
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