How is heterotopic pregnancy defined?

• A. A normal pregnancy with a cyst
• B. An ectopic pregnancy with a normal intrauterine pregnancy
• C. Two pregnancies occurring in the same uterus
• D. Multiple gestations in the fallopian tubes

Answer: (B)

Heterotopic pregnancy is defined as the occurrence of both a normal intrauterine pregnancy and an ectopic pregnancy simultaneously. This situation is relatively rare but can happen when there is fertilization of an egg that implants in the uterine cavity while a second fertilized egg implants outside the uterus, commonly in a fallopian tube.

This concept is important in clinical practice because it emphasizes the need for careful evaluation of patients presenting with abdominal pain or vaginal bleeding during early pregnancy, especially when there is a history of fertility treatments or ectopic pregnancies. Recognizing this condition is crucial for appropriate management, as it involves both monitoring the intrauterine pregnancy and potentially addressing the ectopic pregnancy, often requiring different treatment strategies.

The other choices do not accurately reflect the definition of heterotopic pregnancy. A normal pregnancy with a cyst does not imply the presence of an ectopic pregnancy. Two pregnancies occurring in the same uterus refers to a twin pregnancy but does not involve an ectopic component. Multiple gestations in the fallopian tubes pertains to ectopic pregnancies, but heterotopic pregnancy specifically requires the presence of one normal intrauterine pregnancy alongside one ectopic pregnancy.