In 80 pregnancies with clinical and ultrasonic signs of cervical incompetency, the length of the cervix and the thickness of the anterior wall of a lower uterine segment have been evaluated ultrasonically. We have also measured the width of the endocervical canal and studied the prolapse of fetal membranes (with fetal parts) into the endocervical canal. We evaluated these same parameters in 80 healthy pregnancies. The length of the cervix, the thickness of the anterior wall of a lower uterine segment, and the width of the endocervical canal were followed longitudinally in the patients from the 10th to the 36th gestation week. No statistically significant differences between age groups were found. In four age groups at risk for cervical incompetency, cervical lengths and wall thickness were significantly different (p less than 0.001) from those in comparable controls. Forty-five percent of the patients in the at-risk group, with cervical cerclage, delivered at 37.3 (range: 32 to 41) weeks and 6.25% of pregnancies ended in abortion when the amniotic membrane herniated into the cervical canal, with or without some part of the fetus.

We studied the outcome of fetuses in whom cystic hygroma was diagnosed in the first and early second-trimester of pregnancy using transvaginal ultrasonography. The purpose of this study was to evaluate the association between fetal cystic hygroma and fetal cytogenetic abnormalities, and the long-term prognosis. Thirty-five consecutive fetuses between 9.1 and 13.4 weeks of gestation diagnosed as having a nuchal hygroma were evaluated ultrasonographically and karyotyped. Those with a normal chromosome complement were ultrasonographically monitored throughout the remainder of the pregnancy to document the resolution of the hygroma. Eighteen of thirty-five fetuses were found to have a normal karyotype and five of these were aborted electively. The hygromas resolved in ten of these karyotypically normal fetuses within four weeks of initial diagnosis and they were phenotypically normal at birth. Seventeen fetuses were karyotypically abnormal with trisomy twenty-one being the most common abnormality. Prenatal cytogenetic analysis should be offered to women with fetal cystic hygroma diagnosed in the first trimester. A normal outcome is likely in those without chromosome abnormalities.

Transabdominal placental biopsy under ultrasound guidance was carried out in 260 cases in the second trimester and 50 cases in the third trimester of pregnancy. Placental tissue was aspirated using an 18 or 20 gauge needle. In a total of 310 placental biopsies in the second and third trimester, 100 were performed because of suspicious ultrasonographic findings. Placental biopsy is simple in the presence of severe oligohydramnios where fetal blood sampling is usually more difficult. Oligohydramnios and polyhydramnios were the ultrasonographic findings in 50% of cases and were found to be associated with 30% of abnormal chromosomal findings. There was one (0.3%) abortion within two weeks following placental biopsy. Placental biopsy did not affect the outcome of the pregnancy.

The placental and fetal lung tissue of preeclamptic patients tended to have higher coefficients of variation throughout pregnancy. These results were significantly higher when associated with low-birth-weight babies. There were no significant differences in fetal liver tissue between normotensive and preeclamptic groups.

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