肝囊性肿瘤性病变的鉴别诊断 A cystic lesion is a well-defined lesion with predominant near-water attenuation (0 30 HU) or signal intensity that exhibits negligible enhancement at dynamic imaging. The attenuation or signal intensity can be slightly different from that of pure water because of the diversity in fuid composition. Septa may vary in thickness, uniformity, extent of enhancement, and mural nodularity. 定义 囊内容物通常包括： 液性物质：浆液、粘蛋白、胆汁、血液或混合物； 瘤内坏死； 含水比例较高的物质。 囊壁的组成成分通常包括： 上皮细胞、纤维组织、基质细胞、肿瘤细胞、炎性细胞 等。 先天性病变：
