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Increased amnionic fluid alpha-fetoprotein due to a holoacardium amorphous twin
Clinical Genetics
|April 1, 1981
Summary
Elevated amniotic fluid alpha-fetoprotein in a pregnancy at risk for neural tube defects was caused by a rare holoacardius amorphous twin, not a defect. This finding highlights uncommon causes of high maternal serum alpha-fetoprotein levels.
Area of Science:
- Obstetrics and Gynecology
- Medical Genetics
- Prenatal Diagnostics
Background:
- Maternal age is a risk factor for certain pregnancy complications.
- Alpha-fetoprotein (AFP) screening is used to detect neural tube defects (NTDs).
- Elevated AFP levels can indicate various fetal abnormalities.
Observation:
- Amniotic fluid AFP levels were significantly elevated (over 10 standard deviations above the mean) in a pregnancy solely due to advanced maternal age.
- The pregnancy involved a normal female fetus and a co-existing holoacardius amorphous twin.
Findings:
- The elevated AFP was attributed to the presence of the holoacardius amorphous twin, a rare congenital anomaly.
- This case demonstrates that holoacardius amorphous twins can cause markedly elevated maternal serum AFP levels.
- NTDs were ruled out as the cause of the elevated AFP.
Implications:
- This case underscores the importance of considering rare fetal anomalies in the differential diagnosis of elevated maternal serum AFP.
- Accurate prenatal diagnosis is crucial for appropriate management and counseling.
- Further research into the specific mechanisms causing AFP elevation in cases of conjoined twins is warranted.