1.Previous
3.Next

either the head or the buttocks start to enter the upper part of the pelvis, anchoring the fetus in a longitudinal lie. It is not known in all cases of shoulder presentation why the longitudinal line is not reached, but possible causes include bony abnormalities of the pelvis, uterine abnormalities such as malformations or tumors (fibroids), or other tumors in the pelvis or abdomen. Other factors are a lax abdominal musculature, uterine overdistension (i.e., polyhydramnios), multiple gestation,

1.Previous
3.Next