First trimester ultrasound examination is normal.
Second trimester evaluation is also normal.
Fetus B is sonographically normal.
Patient is 27 years old and at 28 weeks of gestation.
Ali, in my opinion the risk of abnormal karyotype is very low. If fetus A only has ventriculomegaly. This is an isolate finding with low risk of abnormal karyotype.
luis
Sirenomelia (also known as mermaid deformity, symmelia, sympus, symposia, uromelia and monopodia) is an invariably lethal anomaly with a reported incidence of 1 in 60, 000 to 100,000 live births. Around 300 have been reported in the world literature out of which 13 cases are from India. Most of them were diagnosed after birth and no definite antenatal diagnosis was possible in all these fetuses. This anomaly is characterized by varying degree of lower limb fusion, thoracolumbar spinal anomalies, sacrococcygeal agenesis, genitourinary atresia and anorectal atresia. The mostly accepted theory attributes the presence of an aberrant arterial shunt from the upper abdominal aorta connecting the umbilical cord to reach the placenta. As a result, the blood supply of the lower torso is deprived (vitelline artery steal theory).
