A recognised association exists between polyhydramnios and

1. anencephaly.

2. an imperforate anus in the fetus.

3. fetal polycystic kidneys.

The following have a recognised association with transverse lie of the fetus in late pregnancy or labour:

4. microcephaly.

5. high parity.

6. a bicornuate uterus.

The following statements concerning preterm labour are correct:

7. Urinary tract infection is associated with a greater risk.

8. Babies weighing between 500 g and 1000 g should be delivered by caesarean section.

9. Women with a history of subfertility have an increased risk.

The following statements concerning the bony pelvis are correct:

10. The angle of inclination of the pelvic brim is greater in Afro-Caribbean than in Caucasian women.

11. In the anthropoid type of female pelvis, the anteroposterior diameter of the inlet is significantly greater than the transverse diameter.

12. A straight sacrum is associated with a narrow subpubic angle.

13. The sacrosciatic notch is significantly wider in an android pelvis.

14. The female pelvis is characteristically shallower than the male pelvis.

The following are recognised to cross the placenta in clinically significant quantities:

15. indomethacin.

16. lithium.

17. cholestyramine.

18. podophyllotoxin.

Amniocentesis

19. carries an increased risk of orthopaedic deformity as a sequel.

20. has a risk of chorioamnionitis in 3–5% of cases.