Interstitial pregnancy

Editor-In-Chief: Prab R Tumpati, MD
Obesity, Sleep & Internal medicine
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Interstitial pregnancy
Synonyms	Cornual pregnancy
Pronounce	N/A
Specialty	N/A
Symptoms	Abdominal pain, vaginal bleeding
Complications	Rupture, hemorrhage, infertility
Onset	Early pregnancy
Duration	Varies
Types	N/A
Causes	Implantation of the embryo in the interstitial part of the fallopian tube
Risks	Previous ectopic pregnancy, tubal surgery, in vitro fertilization
Diagnosis	Ultrasound, laparoscopy
Differential diagnosis	Ectopic pregnancy, appendicitis, ovarian cyst
Prevention	None specific
Treatment	Methotrexate, surgical intervention
Medication	N/A
Prognosis	Variable, depends on early detection and treatment
Frequency	Rare, 2-4% of all ectopic pregnancies
Deaths	N/A

Interstitial pregnancy is a rare type of ectopic pregnancy where the embryo implants in the interstitial portion of the fallopian tube. This type of pregnancy is considered high risk due to the potential for rupture and life-threatening hemorrhage.

Causes

The exact cause of interstitial pregnancy is unknown, but it is thought to occur when the embryo is unable to travel down the fallopian tube and into the uterus as it normally would. This can be due to a number of factors, including pelvic inflammatory disease, previous ectopic pregnancy, or tubal surgery.

Symptoms

The symptoms of interstitial pregnancy are similar to those of other types of ectopic pregnancy and can include abdominal pain, vaginal bleeding, and shoulder tip pain. However, because the interstitial portion of the fallopian tube can expand more than other parts, symptoms may not appear until later in the pregnancy, often around the 12th week.

Diagnosis

Interstitial pregnancy can be difficult to diagnose because it can appear similar to an intrauterine pregnancy on ultrasound. However, certain features on ultrasound, such as an empty uterus and a mass in the cornual region of the uterus, can suggest an interstitial pregnancy. A serum beta-hCG test can also be used to help diagnose an ectopic pregnancy.

Treatment

Treatment for interstitial pregnancy typically involves surgery to remove the pregnancy and repair the fallopian tube. This can often be done laparoscopically. In some cases, methotrexate may be used to stop the growth of the pregnancy.

See also

• Ectopic pregnancy
• Tubal pregnancy
• Methotrexate

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