对某橡胶厂单体、聚合车间长期接触低浓度丁二烯、0～71.81mg/m~3,平均9.14mg/m~3)44名作业工人连续5年肝脏超声检查结果分析,并设对照(44名)比较,并使年龄、身高、体重等条件基本相同。观察发现,观察组肝右叶最大斜径和肝右叶前后径明显大于对照组(P<0.01);肝左叶前后径也大于对照 Long-term exposure to a low concentration of butadiene, 0 ~ 71.81mg / m ~ 3, an average of 9.14mg / m ~ 3 for a rubber plant monomer polymerization workshop, 44 workers for 5 consecutive years of liver ultrasound examination results and control (44) compared to the same age, height, weight and other conditions. The observation showed that the maximum oblique diameter of the right lobe and the anteroposterior diameter of the right lobe of the observation group were significantly larger than those of the control group (P <0.01)