What causes fetus in fetu

Fetus in fetu is thought to result from the unequal division of the totipotent inner cell mass, the mass of cells that is the ancestral precursor to all cells in the body. The unequal division is thought to occur during the formation of the blastocyst, which can also result in parasitic and conjoined twins Parasitic twin Or fetus in fetu (FIF) is an extremely rare abnormality (1:5, 00,000) that occurs secondary to abnormal embryogenesis in monochorionic diamniotic (two fetuses with same placenta and genetic material but different amnion) pregnancy where a nonviable fetus become enclosed within a normally developing fetus. X ray of Fetus in fetu

Fetus-in-fetu is an extremely rare abnormality that occurs secondary to abnormal embryogenesis in a monochorionic diamniotic pregnancy where a non-viable fetus becomes enclosed within a normally developing fetus Fetus in fetu has made a lot of buzz in the social media, due to the rare yet fascinating character of this medical mystery. However, it is important to emphasize that the condition can be very dangerous for the twin who is carrying his parasitic twin inside of him; as it can cause compression of internal organs, internal bleeding and in the event that it is a malignant teratoma, it can result. Fewer than 200 cases of fetus in fetu have been reported in the medical literature, and of these, only seven were in people ages 15 or older, the authors said. It is not clear what causes fetus in.. 6 Male Predominance. Fetus in fetu births are an extremely rare event in general, but they are even rarer among women than men. There is a two-to-one male predominance in the likelihood of someone being born with another person fused inside them. In some cases, when someone is born with a fetus in fetu case in the abdomen or scrotum, it can cause problems and developmental issues with the.

While many of the cases of fetal arrhythmia can be attributed to the actions of the mother, there are some times where the problems may be the result of issues such as structural problems within the baby's heart Staying in a hot steamy shower for a prolonged amount of time puts a fetus at risk of neural tube defects such as spina bifida, can cause brain damage, and can even lead to pre-term labor. The reason this happens is because the body of the mother can't compensate for trying to deal with the extra heat while focusing on the fetus growth The SSM Health Cardinal Glennon St. Louis Fetal Care Institute has one of the most experienced teams in the country for treating hydrocephalus. We are uniquely trained to diagnose this condition even before a baby is born, and are able treat newborns using minimally-invasive surgical techniques It is not exactly clear what causes fetus in fetu. But scientists think the condition is likely a rare form of parasitic twins, according to Arizona State University. Parasitic twins happen when,..

Fetus in Fetu The Embryo Project Encyclopedi

  1. IUGR generally indicates that there is a problem with the placenta, which is the fetuses main life-source during pregnancy. If the placenta is not functioning properly, then the fetus may stop growing. There are other issues that may cause IUGR, including kidney problems, anemia, and diabetes
  2. ar embryonic disc
  3. As expected from the etiology, most fetus-in-fetu are connected to the host by vessels originating from or around the superior mesenteric artery21; a derivative of the right vitelline artery in mammals. The artery of the fetus-in-fetu derives from the vitelline artery and thus is the equivalent of a superior mesenteric artery
  4. Chromosomal abnormality in the fetus: Around 3 in every five early miscarriages are believed to be related to a fetal anomaly, which suggests that something isn't directly with the baby's chromosomes

Fetus in fetu is a rare cause of intra-abdominal mass. The presence of vertebral and skeletal axis differentiates it from a teratoma. We report an unusual case of two well developed fetuses in the retroperitoneal area of a neonate delivered at term Fetus in fetu may not be diagnosed until it becomes obvious or causes an issue. Most of the time, it's discovered as an abdominal mass in the first year of life, but it's also been reported in. The most common reason for fetal anemia occurs when the baby has a specific difference in blood antigens or proteins from the mother. This is referred to as alloimmunization. This happens when the baby inherits certain blood antigens from the father that the mother does not have

Fetus in fetu (FIF), a rare congenital anomaly - Shasthra

  1. al mass in infants and children. The authors report a recent case of a six-month-old girl who presented with unexplained abdo
  2. It's been theorized that fetus in fetu teratomas are the remains of a twin that was unable to develop and was enveloped by the surviving sibling. Over 90% of fetus in fetu are found before a child..
  3. Fetus In Fetu: 11 Fetoid Forms in a Single Fetus Figure 1. Prenatal sonogram of the fetus showing the calvarium of the largest fetoid structure demarcated with calipers within the fetal abdomen. This causes a mass effect on the adjacent fetal liver. A small amount of ascites is shown along the fetal liver edge
  4. As fascinating as it is horrifying, fetus-in-fetu is a developmental abnormality where, in utero, the larger of a set of twin fetuses absorbs the other into her body. The condition is usually diagnosed shortly after the surviving twin is born, although in a few horrific cases, the absorbed twin is not discovered until adulthood or death
  5. Fetus in Fetu is a rare congenital anomaly in which monozygotic twin is incorporated into its sibling during development. It is a lesser known disease even in the medical community as less than 200 cases have been reported. Some theories have been proposed regarding the pathogenesis of fetus in fetu and clinical manifestations of fetus in fetu vary
  6. Fetus-in-fetu is a term coined by Meckel (circa 1800) describing a parasitic twin included within the abdomen of its partner as a result of an embryonal developmental aberration

Fetus in fetu Radiology Reference Article Radiopaedia

notable Cases of fetus in fetu:. Alamjan Nematilaev was the surviving host of a fetus in fetu. In 2003, aged 7, his school physician in Kazakhstan referred him to hospital after movements were detected in the boy's enlarged stomach.An operation intended to remove a cyst uncovered the fetus of Alamjan's identical twin brother, which had lived as parasitic growth inside the boy throughout his. Hydrocephalus, or water on the brain, is a condition associated with a buildup of cerebrospinal fluid (CSF) in or around the brain. If left untreated, this can lead to brain tissue stretching, significantly affecting your child's growth and development Fetus In Fetu: Doctors Find 40-Year-Old Unborn Twin Growing Inside A Woman, Complete With Face And Hair Aug 19, 2015 05:51 PM By Kristin Magaldi @Kristins140 This woman's unborn twin was inside of her for 40 years, and she had no idea

Fetus in Fetu: Is it a Baby Inside a baby? - MedCrave online

Fetus in Fetu is a rare abnormality where a mass of tissue which resembles a fetus is formed inside the body. This abnormality is very rare and is estimated to occur in 1 in 500,000 births. A fetus is usually alive and lives like a parasite inside the person whom it lies Caution: Potentially disturbing photos included. > Foetus in foetu (or fetus in fetu) is a developmental abnormality in which a mass of tissue resembling a foetus forms inside the body. An early example of the phenomenon was described in 1808 by. The condition is known as fetus in fetu, a very rare situation which occurs when a fetus, that's not completely formed, grows inside the body of the other baby. In this case, the parasitic twin (as is deemed by the condition) had no skull. As the paper reports, the mass can go unnoticed until it causes health problems later on Fetus in fetu is a rare cause of abdominal mass in infants wherein a parasitic twin grows inside a host. The true etiology is unclear. Various theories have been postulated. We report two cases of retroperitoneal fetus in fetu in female infants. PMID: 27941185 [Indexed for MEDLINE] Publication Types: Case Reports

Fetus In Fetu: A Baby Inside Of Another Pregnancy

  1. al mass in the first year of life, but it's also been reported in.
  2. Blood clot issue: The blood-coagulating disorder of the mother (thrombophilia), can make blood clots create in the little and most fragile veins in the placenta or the umbilical cord. These clots can affect the bloodstream and can make the heart of the fetus stop as the baby is denied of blood and oxygen
  3. e -- also called speed, Tina, crank, or ice -- increases the risk of.
  4. Characteristically the fetus-in-fetu complex will be composed of a fibrous membrane (equivalent to the chorioamniotic complex) that contains some fluid (equivalent to the amniotic fluid) and a fetus suspended by a cord or pedicle. The presence of a rudimentary spinal architecture is used to differentiate a fetus-in-fetu from a teratoma, since.
  5. Fetus in fetu means fetus inside fetus and describes a condition in which one functioning twin has an underdeveloped twin inside of its body, usually in the abdomen. Many health problems can arise in the autositic twin as a result of providing for the needs of the parasitic twin
  6. For the fetus-in-fetu: essentially every anomaly resulting from hypoxic and arrested growth has been described. This is manifested by omphaloceles, major neural tube defects (an­en­ce­pha­ly and rachischisis), limb deficiencies and hypo- or aplasia of the organs derived from the meso- and endoderm
Baby Girl Born “Pregnant” With Twins In China, Is One Of

Fetus in fetu may be a parasitic twin fetus growing within its host twin. Very early in a monozygotic twin pregnancy, in which both fetuses share a common placenta, one fetus wraps around and envelops the other. The enveloped twin becomes a parasite, in that its survival depends on the survival of its host twin, by drawing on the host twin's. The nearly 9-pound baby girl had a rare condition called fetus-in-fetu, which happens when a partially developed fetus becomes incorporated into a normally developing fetus (its twin) in the womb. Fetus in fetu is uncommon cause of retroperitoneal mass in infancy that resulted from abnormal embryogenesis. Clinical manifestations vary and mostly presented at infancy It is differentiated from teratoma through its location, benign course, and identification of limb buds and well-organized organs Fetus in fetu (FIF) is a rare cause of abdominal mass in children. The pathogenesis of FIF can be explained by the 'included-twin' theory in which the FIF is a diamniotic, monochorionic, monozygotic twin that becomes incorporated into the body of the host twin after anastomosis of the vitelline circulation [ 1 ]

Doctors Find Bizarre Mass of Bone, Teeth & Hair in Teen's

So, it is possible to detect the fetus in fetu during the infancy stage. If the doctor misses it during the ultrasound, it gets detected before the child is 18 months of age. So, the fetus in fetu is a medical rarity. But, the teratoma has spinal structure and limb buds. The only missing part from the normal fetus is the brain structure After examining the teen, doctors found she had the rare condition fetus in fetu, or FIF, where a malformed fetus is found in the body of its twin. The pain the teen was experiencing came from a tumor made from the malformed twin's remaining teeth, hair, and bones. There is only one case of FIF for every 500,000 births Abstract. Fetus in fetu is a rare abnormality secondary to the abnormal embryogenesis in a diamniotic, monochorionic pregnancy. It is an unusual condition in which a vertebrate fetus is enclosed within the abdomen of a normally developing fetus. Presented are the computed tomographic findings in two cases in which imaging findings were.

10 Twisted Facts About Fetus In Fetu From Science - Listvers

A cystic teratoma may cause pain in the abdomen and abnormal vaginal bleeding. Cystic teratomas are examples of what are called germ cell tumors. Germ cells are reproductive cells, commonly known as eggs and sperm. When a fetus is developing, germ cells can sometimes end up in other areas of the body, so germ cell tumors may potentially arise. Fetus In Fetu: 11 Fetoid Forms in a Single Fetus Review of the Literature and Imaging. Correction(s) for this article. Rebecca E. Gerber MD, gerber104@gmail.com; Warren Alpert Medical School, Brown University, Providence, Rhode Island USA. Search for more papers by this author. Aya. INTRODUCTION Fetus in Fetu is a fetiform calcified mass or an encapsulated pendunculated vertebral tumor. 1,2 It is a malformed parasitic twin included in host twin due to unequal division of totipotent cells of a blastocyst, resulting in the inclusion of small cellular mass in a more mature embryo thus forming a monozygotic, diamniotic twin pregnancy. 3 It is a rare condition which was first.

Fetus-in-fetu: report of a case and a review of the literature. Mauricio Escobar. Related Papers. Fetus in fetu: two case reports and review of literature. By Yogendra Sanghavi and Shivaji Mane. Fetus-in-Fetu Vs retroperitoneal mature teratoma: A revisit of the known rarity However, because small, predominantly intrapelvic SCT may go undiagnosed for years, until they grow large enough to cause pain, constipation, or other tumor-associated symptoms, the incidence of malignancy within SCT increases with age. Fetus in fetu is a very rare condition. The overall incidence is 1 : 500,000 live births. The. Editor-In-Chief: C. Michael Gibson, M.S., M.D. Synonyms and Keywords: Fœtus in fœtu Overview. Fetus in fetu is a developmental abnormality containing entire organ systems, even major body parts such as torso or limbs.. Historical perpective. Alamjan Nematilaev was the surviving host of a fetus in fetu. In 2003, aged 7, his school physician in Kazakhstan referred him to hospital after.

Fetus-in-fetu occurs when the embryo fails to divide correctly in twins. This usually happens during the first week of gestation. As a result, it causes one twin to be confined in the other's body, forming a parasitic twin Causes of fast fetal growth during pregnancy Most women tend to get concerned, if they believe that the fetus is not growing at the rate that it shouldl However, instances of a fetus growing too fast during pregnancy could also be a case for concernr Given below are some of the factors that could lead to a fetus growing too fast during the. The fetus in fetu teratoma is most often detected in infancy. It can occur in children of either sex. In 90 percent of cases these teratomas are found before the child reaches 18 months of age Fetus in fetu starts to develop very early in a monozygotic twin pregnancy, in which both fetuses share a common placenta, and one fetus wraps around and envelops the other. The enveloped twin becomes a parasite , in that its survival depends on the survival of its host twin, by drawing on the host twin's blood supply

Smoking during pregnancy exposes you and your baby to many harmful chemicals, which limit the baby's supply of oxygen and the delivery of nutrients. Nicotine permanently damages a baby's brain and lungs. Smoking during pregnancy has also been linked with many health problems, including: Problems with the placenta. Premature birth. Birth defects Fetus-in-fetu (FIF) is a parasitic monozygotic monochorionic diamniotic twin that implants itself and grows within the body of its normal karyotypically identical sibling [1]. It is a rare anomaly (around 200 published cases in English literature [2]), which can be differentiated from a retroperitoneal teratoma by the presence of a calcified. Fetus in fetu: a very rare cause of abdominal mass in a male infant, case report Author: Ragheb Assaf Subject: Introduction: Fetus in fetu is an extremely rare congenital pathology that has an incidence of one in 500 000 births. This pathology mostly occurs in infants who present with variable manifestations such as a painful abdominal mass and. Scanogram. CT scan demonstrates a roughly 7cm diameter density in the right upper zone with preservation of liver and right kidneys border indicating that this is most likely located retroperitoneally. The presence of calcification and bone density suggesting teratoma or FIF as the cause. From the case: Fetus in fetu. Pathology Blighted ovum is a type of failed pregnancy in which the fetal node fails to develop . It is usually diagnosed at 6-7 weeks of gestation. Diagnosis of blighted ovum at 5 weeks is definitely erraneous. Misoprostol is known to cause various defects in the fetus, including cranial nerve deficits and anomalies in the heart

What Does Irregular Fetal Heartbeat Mean

  1. It is not clear what causes fetus in fetu. But scientists think the condition is likely a rare case of parasitic twins, in which one identical twin is absorbed by the other during early pregnancy, according to Arizona State University. The tissue of the parasitic twin is dependent upon the body systems of the host twin to survive.
  2. Fetus in fetu doesn't require wombs or female organs, meaning that it can and has happened to males. So far, scientist don't really know for sure what causes this abnormality. According to the.
  3. 1 00 cases of fetus-in-fetu have been reported in the literature, and only two of them were intra­ cranial in location (1, 6). Another reason related to the differential features between fetus-in-fetu and teratoma. Because fetus-in-fetu develops through the stage of primitive streak and somit
  4. Gêmeo parasita [1] [2] ou também chamado fetus in fetu [3] é um caso muito raro no qual um feto não viável ou malformado é englobado pelo feto do seu gêmeo com desenvolvimento normal, [4] [5] em geral alojando-se no abdômen ou na cavidade retroperineal.Acredita-se que ocorre um caso a cada 500 mil nascimentos [6], e há menos de 100 casos citados pela literatura em todo o mundo [3]
  5. Fetus in fetu occurs in monozygotic, monochorionic pregnancies, where there is a common placenta. That means IDENTICAL twins, folks, and that also means a woman or girl cannot possibly be carrying a BOY fetus in fetu within her body

15 Ordinary Things That Put Fetuses In Danger BabyGag

  1. Hi, I have gone through your question and understand your concerns. Edema on the forehead( scalp) of the fetus, with excessive weight gain, and increased fluid level around the fetus is suggestive of fetal hydrops, which can be due to: 1. Fetal anemia, due to Rh incompatibility, or any infection..
  2. The baby's condition, known as fetus-in-fetu, is incredibly rare, occurring in only about 1 in every 500,000 births. It's not clear exactly why it happens. Weird things happen early, early in the pregnancy that we just don't understand, said Dr. Draion Burch, an obstetrician and gynecologist in Pittsburgh, who goes by Dr. Drai
  3. Fetus In Fetu by Self Disgrace, released 09 March 2020 1. Deliverance 2. Never Born 3. The Mansion 4. In The Name Of Lies 5. War 6. In Chains 7. Cruel Tribulation Self Disgrace CD Title : Fetus In Fetu Item # MR-018 Price : €7.99 + S&H From : Milan, Italy Release Year : 2020 Label : Malevolence Records© Tracklist: 1) Deliverance 2) Never Born 3) The Mansion 4) In The Name Of Lies 5) War 6.
  4. However, since fetus in fetu only occurs in about 1 in 500,000 births currently, we might be talking about one extra case a year globally, he says. Read more: Miniature brain and skull found.
  5. ants pose the biggest risk to children and fetuses

Fetal Hydrocephalus: Causes, Diagnosis & Treatment SSM

SELF DISGRACE Follow us on facebook! Fetus In Fetu by Self Disgrace, released 09 March 2020 1. Deliverance 2. Never Born 3. The Mansion 4. In The Name Of Lies 5. War 6. In Chains 7. Cruel Tribulation Self Disgrace CD Title : Fetus In Fetu Item # MR-018 Price : €7.99 + S&H From : Milan, Italy Release Year : 2020 Label : Malevolence Records© Tracklist: 1) Deliverance 2) Never Born 3) The. Fetus in fetu is similar to these topics: Pelvic digit, Lithopedion, Diphallia and more. Topic. Fetus in fetu. Share. Topics similar to or like Fetus in fetu. Developmental abnormality in which a mass of tissue resembling a fetus forms inside the body

Fetus in Fetu happens very early in the development of an embryo, when it is just a ball of cells called a blastocyst. A blastocyst sometimes divides and grows into two fetuses, but in this rare condition they divide unevenly, and one cell mass gets stuck inside the other Rare Presentation of Fetus in Fetu - Laparoscopic Approach: A Case Report Vandana Menona, c, Bedaya Amro a, Tasnim E.V. Kelothb, Arnaud Wattiez a, Maan Hachmib Abstract Fetus in fetu (FIF) is an extremely rare condition in which a mal-formed fetus is found most commonly in the abdomen of a living twin What causes these cells to try and create a new, impossible life? If this was the case, they would not qualify as teratomas, falling into the fetus in fetu category. But the two phenomenons are mainly regarded as separate. To distinguish one from the other, pathologists rely on the existence of a spinal column (which is present in the fetus. In rare instances, a zygote will be formed with XY sex chromosomes, be a genetic male, develop into a fetus, have male sexual organs visible at birth, be registered as a male and yet have female structures in their brain located in the central part of the bed nucleus of the stria terminalis (BSTc). 7,8 This will cause them to identify their.

Finally, fetus in fetu parasitic twining is the stuff of nightmares. Fetus in fetu involves the complete encapsulation of a parasitic twin within the body of the autosite. This means it is conceivable a person can go through life unaware that they carry within them the body of their sibling, a sibling that is literally feeding off of their body. Fetus in Fetu And with Fetus in Fetu -- A fetus (or teratoma) that dies is not absorbed by the other growing twin, but exists as a separate entity inside the fetus that will survive? And with Fetus in Fetu --- is it really thought to be a teratoma and not just a non-viable fetus So, it is possible to detect the fetus in fetu during the infancy stage. If the doctor misses it during the ultrasound, it gets detected before the child is 18 months of age. So, the fetus in fetu is a medical rarity. But, the teratoma has spinal structure and limb buds. The only missing part from the normal fetus is the brain structure Erythroblastosis fetalis causes the mother's white blood cells to attack her baby's red blood cells as they would any other foreign invader. It occurs when the blood types of the mother and her.

Fetus in fetu is a rare congenital anomaly in which a malformed parasitic twin is found within host [1,2]. The majority of cases appear in infancy with an incidence reported at 1 in 500,000 births [3] The fetus-in-fetu condition is believed to arise soon after the 17th day of gestation, when the embryo flattens out like a disc and then folds in on itself to form the elongated fetus The condition is called fetus in fetu, It is sometimes not detected until much later in life, and can cause serious health complications for the host twin. SWNS Objective: Fetus-in-fetu (FIF) is an extremely rare disease, and most prior publications are single case reports. Here, we describe the clinical characteristics, imaging manifestations, and the treatment and related complications of FIF from a large tertiary pediatric referral center.Materials: After institutional review board approval, patients with a diagnosis of FIF between January 2010 and.

Fetus in fetu is an unusual digression from the normal twinning process which often presents as a mass in neonates. Approximately 80 reports have been documented in the literature to date. Approximately 80 reports have been documented in the literature to date مرکزی صفحہ Journal of Pediatric Hematology/Oncology Fetus in Fetu: Unexpected Cause of an Abdominal Mass. Journal of Pediatric Hematology/Oncology 2002 / 12 Vol. 24; Iss. 9. Fetus in Fetu: Unexpected Cause of an Abdominal Mass Wagner, Lars, Scaife, Eric, White, Keith S., Zhou, Holly

Structural cardiac malformations and arrhythmias are the most common cause, while other conditions associated with fetal hydrops include genetic disorders, metabolic disorders, tumors, hematologic abnormalities and congenital infections . If the complete diagnostic work-up assessment is negative, the PE is classified as isolated Fetus in fetu (FIF) is a rare congenital anomaly resulting from anomalous embryogenesis in diamniotic monochorionic twin pregnancy [].Johann Friedrich Meckel, a German anatomist, was the first one to describe this condition in the 1800s, and so far, fewer than 200 cases are reported in literature [].The exact etiology is unclear

Fetus inside fetus (or fetus in fetu); when a tissue mass resembling a fetus usually develops inside the body of a newborn The cause of formation of Fetiform Teratoma is unknown. Also, presently, the risk factors for the same are not well-established Fetus in fetu is an extremely rare developmental anomaly of humans in which 1 monozygotic twin is completely incorporated into the other twin's body. 6, 9 Diagnosis of this condition can be confusing, the major differential being a mature teratoma. 10 However, by definition, the tissues of a true fetus in fetu are arranged around a vertebral axis, whereas those of a teratoma are less well.

Middle East African Journal of Ophthalmology : Table of

Weird: How Does a Baby's 'Twin' End Up Inside His Abdomen

Doctors instead found a fetus. In cases of fetus-in-fetu, the tissue growth only survive in utero and as a result is considered to be more of a tumor than an actual fetus. Amy Graf Fetus in fetu (FIF) is an extremely rare cause of infantile abdominal mass where a rudimentary, malformed monozygotic-diamniotic twin grows inside the other twin. We describe a male infant with double or twin fetuses in fetu The growth of a fetus in fetu initially parallels its twin in the uterus, but it abruptly stops because of the vascular dominance of the host twin or an inherent defect in the parasitic twin [1,2,3,4,5,6,7]. Fetus in fetu is always anencephalic, but the vertebral column and the limbs are present in almost all cases (91% and 82.5%, respectively)

Fetus10 Weird birth defects that will leave you shocked!Parents share pictures of Baby Gabriel miscarried at 14

15 Signs The Fetus Is Not Developing BabyGag

By 12 weeks of pregnancy: The fetus fills the entire uterus. By about 14 weeks: The sex can be identified. By about 16 to 20 weeks: Typically, the pregnant woman can feel the fetus moving. Women who have been pregnant before typically feel movements about 2 weeks earlier than women who are pregnant for the first time This is the exact description of fetus in fetu in the paper (journal, not newspaper ok =^.^=): Gross examination of the sac showed a thin walled membrane filled with sebaceous material and hair. Contained within that sac was a structure with fetal-like features, 14 cm long, weighing 754 g covered with thick wrinkled skin and appendages

What causes brain problems in fetal? Congenital brain defects may be caused by inherited genetic defects, spontaneous mutations within the genes of the embryo, or effects on the embryo due to the mother's infection, trauma, or drug use. Early in fetal development, a flat strip of tissue along the back of the fetus rolls up to form a tube Ultrasound examinations are often done as part of prenatal care. This test allows the doctor to examine babies before they are born. With ultrasound, the doctor can see the baby's internal organs, including the kidneys and urinary bladder. Occasionally, an abnormality is detected in the developing urinary tract. A doctor can then determine whether treatment is necessary Response to Fetus-in-Fetu 2006-03-29 23:39:09 At 3/29/06 11:24 PM, Gunter45 wrote: Stop getting in a pissing contest over semantics. But you're the one who started the entire thing Fetus in fetu or Foetus in foetu is a rare medical condition in which a person develops the forming of a mass of tissue resembling a fetus inside the body.; Fetus in fetu occurs to about one in 500 000 live births and is said to either be the cause of a normal fetus eveloped inside its twin or that the mass is a highly developed teratoma (an encapsulated tumor) The fetus had no evidence of any other infection that could have caused the damage and the mother did not have any of the known genetic causes of microcephaly, Avsic's team said