What is a parasitic twin?

A parasitic twin is a type of conjoined twin where one fetus stops developing but remains attached to its twin. The other twin continues to develop, but is usually born with the limbs, organs or other tissue structures from its parasitic twin still attached. It's a very rare condition. Appointments 216.444.6601.

my.clevelandclinic.org - Parasitic Twin: Causes, Diagnosis & Removal - Cleveland Clinic

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Overview What is a parasitic twin? A parasitic twin is a rare condition that happens when a conjoined twin stops developing. The parasitic twin never fully develops but stays attached to its twin, who continues to develop until birth. A parasitic twin happens early in embryonic development, so its organs or limbs can be nearly unrecognizable. This results in the healthy, developed twin (the dominant or autositic twin) being born with extra limbs, organs or tissue from its parasitic twin. The dominant twin is at high risk for medical complications and requires medical treatment after birth. A parasitic twin is also known as: Asymmetrical or unequal conjoined twins.

Vestigial twins.

Fetus in fetu.

Heteropagus twins. What are the types of parasitic twin? The type of parasitic twin is named for where it attaches or joins to the dominant twin. Cephalopagus : The back of the head.

: The back of the head. Craniopagus : At the skull.

: At the skull. Epigastric : The upper part of the abdomen.

: The upper part of the abdomen. Ischiopagus : At the pelvis.

: At the pelvis. Omphalopagus : At the abdomen.

: At the abdomen. Parapagus : At the torso.

: At the torso. Pygomelia : At the buttocks.

: At the buttocks. Pyopagus : At the low back or spine.

: At the low back or spine. Rachipagus : At the middle back. : At the middle back. Thoracopaus: At the chest. Is a parasitic twin the same as conjoined twins? A parasitic twin is a type of conjoined twin. It accounts for about 10% of all conjoined twins. Conjoined twins are two fully developed fetuses that are connected at birth. Conjoined twins share one or more organs and are usually attached at their back, chest or torso. A parasitic twin is one fully developed fetus and one undeveloped fetus. The undeveloped fetus is nonfunctional and doesn’t survive the pregnancy. How common is a parasitic twin? A parasitic twin is very rare. It affects less than 1 in 1 million births worldwide. Symptoms and Causes Are there symptoms of a parasitic twin? There are no symptoms of parasitic twins. What causes a parasitic twin? No one is entirely sure, but researchers point to two main theories — the fission theory and the fusion theory. The fission theory describes an incomplete separation of one fertilized egg. When a fertilized egg fully separates, the result is identical twins. If a fertilized egg partially splits or doesn’t fully separate, it results in conjoined twins. A parasitic twin happens when one of the fetuses in a conjoined twin stops developing. The fusion theory suggests two separate fertilized eggs grow or fuse together during development. A parasitic twin occurs when one of these two fertilized eggs stops developing but remains attached to its twin. Another theory suggests that it occurs due to vascular problems within your uterus during fetal development. Diagnosis and Tests How is it diagnosed? Your healthcare provider may diagnose parasitic twins in a prenatal ultrasound. Further testing may be needed to determine how the parasitic twin connects to the dominant twin and what organs are involved. Other imaging tests could include magnetic resonance imaging (MRI) or a computerized tomography scan (CT scan). If a parasitic twin is suspected, an echocardiogram may be necessary to determine if the parasitic twin is putting strain on the autositic (dominant) twin’s heart. In other cases, a parasitic can’t be seen until the dominant twin is born. The parasitic twin may be too small or appear as a lump or mass of tissue.

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Management and Treatment How do doctors treat a parasitic twin? If left untreated, the dominant twin could be susceptible to diseases and complications from supporting its parasitic twin. Once the dominant twin is born, healthcare providers evaluate them to ensure their heart, lungs and other organs are working properly. Each situation is different and depends on how the parasitic twin has attached and the extent of the attachment. Surgical removal of the parasitic twin from the dominant twin is necessary. A surgeon removes the bones, organs and tissues from the surviving twin. This procedure has several risks like infection, hernia or other surgical complications. Prevention How can I prevent this? Parasitic twins are unpreventable. It occurs during fetal development. Living With What’s the outlook for parasitic twins? A parasitic twin isn’t alive and dies in the womb while attached to the dominant twin. The surviving, dominant twin may need comprehensive medical treatment to remove tissue, organs or limbs from its parasitic twin. The surviving twin may have respiratory or cardiovascular problems that require monitoring. The instances of parasitic twins are rare, but the dominant twin usually survives.

my.clevelandclinic.org - Parasitic Twin: Causes, Diagnosis & Removal - Cleveland Clinic

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