摘要膝关节大多数病变,包括感染、肿瘤或滑膜炎由于灌注增加或水含量增加,表现为MRI T_2WI FSE序列高信号。T2WI(脂肪抑制或非脂肪抑制)序列低信号病变并不常见,易被忽略,其鉴别类型有限,包括真空现象、游离体、腱鞘巨细胞瘤、类风湿性关节炎、血色病、痛风、淀粉样变性、软骨钙化、羟磷灰石沉积病、树枝状脂肪瘤、关节粘连和医源性病 Abstract Most lesions of the knee, including infections, tumors or synovitis, show high signal intensity of the MRI T 2 WI FSE sequence as a result of increased perfusion or increased water content. T2WI (fat-suppressed or non-fat-suppressed) sequences of low-signal lesions are uncommon and easily overlooked and have limited types of identification including vacuum, free radical, giant cell tumor of the tendonoid, rheumatoid arthritis, hemochromatosis, gout, starch Degeneration, cartilage calcification, hydroxyapatite deposition disease, dendritic lipoma, joint adhesion and iatrogenic disease