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Related Concept Videos

Teratogenicity01:07

Teratogenicity

The ability of a drug to produce structural deformations and functional abnormalities in the developing embryo or the fetus is called teratogenicity, and the drug producing this effect is known as a teratogen. Teratogenic effects include stillbirth, miscarriage, intrauterine growth restriction, and neurocognitive delay. A teratogen may affect the embryo at different stages of development, which is important in determining the type and extent of the damage. During blastocyst formation, the early...
Fetal Circulation01:14

Fetal Circulation

Fetal circulation is a unique system that facilitates the exchange of gases, nutrients, and waste products between the developing fetus and the mother. This intricate process takes place through a special organ called the placenta.
Two umbilical arteries transport blood from the fetus to the placenta. At the placenta, the blood absorbs oxygen and nutrients while simultaneously eliminating waste products. This oxygen-enriched and nutrient-rich blood then returns to the fetus through one...
Development of the Sexual Organs in the Embryo and Fetus01:15

Development of the Sexual Organs in the Embryo and Fetus

Development of the reproductive organs in an embryo starts from a bipotential state. This means the early embryo can develop either male or female reproductive organs. The formation of these organs begins with the growth of gonadal ridges that arise from the intermediate mesoderm during the fifth week of development.
Near the gonadal ridges, two duct systems are present: the mesonephric ducts (Wolffian ducts) and paramesonephric ducts (Müllerian ducts). These ducts form the basis for the male...
Fertilization01:38

Fertilization

During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ovary, and travels into the fallopian tubes. The process requires several key steps: 1) sperm present in the genital tract must locate the egg; 2) once there, sperm need to release enzymes to help them burrow through the protective zona pellucida of the egg; and 3) the membranes of a single sperm cell and egg must fuse, with the sperm...
In Vitro Fertilization01:24

In Vitro Fertilization

In vitro fertilization (IVF) is a form of assisted reproductive technology where an egg is fertilized with sperm in a controlled laboratory environment before transferring the resulting embryo into the uterus. This process is designed to help individuals and couples experiencing difficulties conceiving.
The IVF process begins with ovarian stimulation, during which reproductive endocrinologists prescribe hormonal medications to stimulate the ovaries to produce multiple eggs instead of the single...

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Related Experiment Video

Updated: May 21, 2026

Transuterine Fetal Tracheal Occlusion Model in Mice
06:31

Transuterine Fetal Tracheal Occlusion Model in Mice

Published on: February 5, 2021

Revisiting fetus-in-fetu.

Dilip Gude1, Batta Ramasubba Rayudu, Dharam Bansal

  • 1Acute Medical Care, 3rd Floor, Medwin Hospital, Chirag Ali Lane, Nampally, Hyderabad, Andhra Pradesh, India. letsgo.dilip@gmail.com

Annals of Saudi Medicine
|June 19, 2012
PubMed
Summary

Fetus-in-fetu is a rare congenital anomaly where a parasitic twin develops inside its host. Early diagnosis and management are crucial for potential complications in affected infants.

Area of Science:

  • Medical Genetics
  • Developmental Biology
  • Pediatric Surgery

Background:

  • Fetus-in-fetu is an extremely rare congenital anomaly.
  • Characterized by a malformed parasitic twin enclosed within the abdominal cavity of its host twin.
  • Fewer than 100 cases documented in medical literature.

Observation:

  • A case report of an infant presenting with jaundice.
  • A steadily growing abdominal mass was noted.
  • Diagnosis confirmed as fetus-in-fetu syndrome.

Findings:

  • Discusses the pathophysiology of fetus-in-fetu.
  • Highlights the complexities associated with the condition.
  • Reviews available management strategies.

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Is My Mouse Pregnant? High-Frequency Ultrasound Assessment
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Is My Mouse Pregnant? High-Frequency Ultrasound Assessment

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Last Updated: May 21, 2026

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Model Surgical Training: Skills Acquisition in Fetoscopic Laser Photocoagulation of Monochorionic Diamniotic Twin Placenta Using Realistic Simulators
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Model Surgical Training: Skills Acquisition in Fetoscopic Laser Photocoagulation of Monochorionic Diamniotic Twin Placenta Using Realistic Simulators

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Implications:

  • Emphasizes the need for high clinical suspicion for associated complications.
  • Provides insights into the diagnosis and treatment of this rare anomaly.
  • Contributes to the understanding of parasitic twin development.