低场MRI在胎盘植入诊断中的应用

Application of low field MRI in diagnosis of placental implantation

目的:探讨产后胎盘植入低场MRI影像学表现。方法:回顾性分析产后胎盘植入患者8例,总结其MRI图像特点及诊断价值。结果:7例子宫增大,宫颈肿大并信号异常,T2WI、STIR高信号,结合带完整性破坏;植入胎盘位于宫底4例,前下壁1例、右前壁2例,左宫角1例;8例深入肌层均在2型以上;植入胎盘呈类圆形、椭圆形、不规则形;胎盘信号不均匀,5例在T1WI、T2WI、STIR序列均呈高低混杂信号;7例植入胎盘部部分边缘清楚,显示线样低信号环;增强扫描植入胎盘不均匀强化;近植入处周围血管增多。结论:低场MRI对胎盘植入诊断敏感性、特异性高,对临床方案选择具有重要价值。

Objective： To explore the low field MRI imaging manifestations of postpartum placental implantation. Methods i Eight patients with postpartum placental implantation were analyzed retrospectively, the MRI image characteristics and diagnostic value were summarized. Results： The uteruses of five cases enlarged, cervix also enlarged, and the uterine signals were abnormal, showing high T2WI, STIR signals, the integrity of junction was destroyed ; the positions of implanted placentae ： uterine fundus （ four cases）, anterior and inferior wall （one case）, right and front wall （two cases）, left uterine angle （one case） ; the types of 8 cases with muscular layer infiltration were above type 2; the shapes of implanted placentae： quasi -circular, oval, and irregular form; the placental signals were not symmetrical, mixed high and low signals were observed in five cases in T1WI, T2WI, STIR images; partial margins of implanted placentae in seven cases were clear, showing linear low signal cycle; the implanted placentae were enhanced asymmetrically; the number of blood vessels adjacent to implantation increased. Conclusion ： The sensitivity and specificity of low - field MRI for diagnosis of placental implantation are high, which has important value for choice of clinical protocols.