Blighted ovum

Anembryonic Pregnancy (Empty Gestational Sac) – Comprehensive Guide

What is Anembryonic Pregnancy?

Anembryonic pregnancy (empty gestational sac) is a condition where a fertilized egg implants in the uterus, but the embryo fails to develop. A gestational sac forms, but no embryo is visible inside.

How is it Diagnosed?

• Beta-hCG levels rise
• A gestational sac is seen on ultrasound
• However, no embryo or heartbeat is observed

When is it Diagnosed?

It is usually diagnosed with an ultrasound performed around the 6th–7th week of pregnancy.

What Causes It?

• Chromosomal (genetic) problems (most common cause)
• Embryonic development defects
• Rarely, hormonal or uterine factors

Symptoms

• Positive pregnancy test
• May experience pregnancy symptoms like nausea, tenderness
• Later, spotting or bleeding may begin

Anembryonic Pregnancy in IVF

It can also occur in IVF treatment. The most common reason is the embryo not being genetically healthy.

Who is it More Common In?

• Advanced maternal age
• Poor embryo quality
• Genetic problems

Treatment

• Expectant management (spontaneous miscarriage)
• Medical miscarriage
• Dilation and curettage (D&C) (if necessary)

Subsequent Course

In most patients, subsequent pregnancies proceed normally. It is not a cause of infertility on its own.

When is Investigation Needed?

• Recurrent anembryonic pregnancy
• Further investigation is performed in cases of recurrent miscarriage

Clinical Fact

Anembryonic pregnancy is mostly genetic in origin and is not a preventable condition.

Conclusion

Anembryonic pregnancy is a distressing but common condition. Most patients achieve healthy outcomes in subsequent pregnancies.