Huynh Tuan N, Johnson Thor, Poder Liina, Joe Bonnie N, Webb Emily M, Coakley Fergus V
Department of Radiology and Biomedical Imaging, University of California San Francisco, CA, USA.
J Comput Assist Tomogr. 2011 Jul-Aug;35(4):459-61. doi: 10.1097/RCT.0b013e31822227c3.
Magnetic resonance imaging findings in 2 patients with misleading T1 hyperintensity seen only on fat-suppressed images are presented; one with a renal cell carcinoma that was misinterpreted as a hemorrhagic cyst and the other with an ovarian serous cystadenocarcinoma that was misinterpreted as a complicated endometrioma. The apparent T1 hyperintensity on fat-suppressed images in these cases was likely due to varying perception of image signal dependent on local contrast, an optical effect known as the checker-shadow illusion. T1 pseudohyperintensity should be considered when apparently high T1 signal intensity is seen only on fat-suppressed images; review of non-fat-suppressed images may help prevent an erroneous diagnoses of blood-containing lesions.
本文报告了2例仅在脂肪抑制图像上出现误导性T1高信号的患者的磁共振成像结果；1例肾细胞癌被误诊为出血性囊肿，另1例卵巢浆液性囊腺癌被误诊为复杂性子宫内膜瘤。这些病例中脂肪抑制图像上明显的T1高信号可能是由于图像信号因局部对比度而异的不同感知，这是一种称为棋盘阴影错觉的光学效应。当仅在脂肪抑制图像上看到明显的T1高信号时，应考虑T1假高信号；查看非脂肪抑制图像可能有助于防止对含血病变的错误诊断。
