Hilpert P L, Friedman A C, Radecki P D, Caroline D F, Fishman E K, Meziane M A, Mitchell D G, Kressel H Y
AJR Am J Roentgenol. 1986 Jun;146(6):1167-72. doi: 10.2214/ajr.146.6.1167.
Nine patients with polycystic kidney disease were examined by MRI, CT, and sonography. MRI distinguished among simple cysts, cysts complicated by prior hemorrhage, and coexistent renal cell carcinoma. On T1-weighted spin-echo images, simple renal cysts appeared as round, homogeneous, low-signal regions with smooth outer margins and a distinct interface with remaining normal renal parenchyma or adjacent cysts. Hemorrhagic cysts were seen as homogeneous medium- to high-signal intensity regions, and about half of them correlated with hyperdense cysts by CT. In five cases, fluid-iron levels were evident by dependent high-intensity layering within the cysts. Renal cell carcinomas occasionally show high intensity because of hemorrhage, but intratumoral fluid-iron levels have not yet been described. These results suggest that MRI is useful in differentiating between simple cysts, hemorrhagic cysts, and neoplasms when CT and sonography are indeterminate.
对9例多囊肾病患者进行了MRI、CT和超声检查。MRI能够区分单纯囊肿、既往有出血的囊肿以及并存的肾细胞癌。在T1加权自旋回波图像上，单纯肾囊肿表现为圆形、均匀的低信号区，外缘光滑，与剩余正常肾实质或相邻囊肿有明显界限。出血性囊肿表现为均匀的中等至高信号强度区，其中约一半在CT上与高密度囊肿相关。5例中，囊肿内可见因液体铁水平而出现的依赖于重力的高强度分层。肾细胞癌偶尔因出血而表现为高强度，但肿瘤内液体铁水平尚未见报道。这些结果表明，当CT和超声检查结果不明确时，MRI有助于区分单纯囊肿、出血性囊肿和肿瘤。
