Tissue refers to placental fragments retained in the uterine cavity.

Tissue指的是胎盘组织部分残留在子宫腔中。

Finally, a structural cause of secondary amenorrhea is intrauterine adhesions, or Asherman syndrome, which is when there is scar tissue inside the uterine cavity, typically in a female that has undergone uterine instrumentation in the past.

最后，继发性闭经的一种解剖结构性病因是宫腔粘连，即Asherman综合征，也就是宫腔内存在疤痕组织，典型的原因是女性曾经有过子宫有创检查。