a surgical dilation and evacuation of the uterus may be undertaken between 12 and 20 weeks ' gestation for women with prior uterine surgery , contraindication to prostaglandin use , no future childbearing being desired , and a fetus having a known lethal chromosomal abnormality ( e.g . trisomy 13 or 18 ) .
C0008625
chromosomal abnormality
C0152095
trisomy 13