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At 13 weeks, there was enlargement of the bladder 30 mm and bilateral hydronephrosis with reduced amniotic fluid; the pregnancy was terminated.

reported that the diameters of the two ventricles were similar and increased linearly with gestation from about 1.

There are several case reports on the sonographic diagnosis of cardiac defects at 11—14 weeks of gestation.

Mild hydronephrosis or pyelectasia may be due to relaxation of smooth muscle of the urinary tract by the high levels of circulating maternal hormones, or maternal—fetal overhydration.

At 8—10 weeks, of gestation, all fetuses demonstrate herniation of the midgut that is visualized as a hyperechogenic mass in the base of the umbilical cord; retraction into the abdominal cavity occurs at 10—12 weeks and it is completed by 11 weeks and 5 days 11,67,68.

Johnson P, Sharland G, Maxwell D, Allan L.

Table 1 - Case reports on the prenatal diagnosis of anencephaly at 11—14 weeks of gestation Author normal normal acrania anencephaly Goldstein et al.

Diagram of early gestational sac.

It is imperative to ask your health care provider if you need to keep the bladder full before the scan.

Five fetuses with cardiac defects were identified, including one with a small left ventricle and pericardial effusion at 11 weeks, one with ventricular septal defect, dilated left ventricle and pericardial effusion at 12 weeks that was subsequently diagnosed as tetralogy of Fallot, one with ventricular septal defect and overriding aorta at 13 weeks, one with dextrocardia at 14 weeks that was subsequently found to also have a ventricular septal defect, and another with a single atrium and single ventricle at 14 weeks.

In contrast, Blaas et al.

The future foramina of Monro are wide during week 7.