Related Experiment Video
Updated: Jun 18, 2026

09:04
Guide Wire Assisted Catheterization and Colored Dye Injection for Vascular Mapping of Monochorionic Twin Placentas
Published on: September 5, 2011
Dicephalic parapagus conjoined twins: a rare second trimester sonographic diagnosis
Ahmet Mete1, Fatma Bahar Cebesoy, Ebru Dikensoy
1Gaziantep University Medical School, Department of Radiology, Sahinbey, Gaziantep, Turkey.
Journal of Clinical Ultrasound : JCU
|November 20, 2009
Summary
Conjoined twins, a rare congenital malformation, occur when embryonic development is advanced. This case highlights the diagnosis of dicephalic parapagus conjoined twins using transabdominal sonography.
Area of Science:
- Medical Science
- Embryology
- Radiology
Background:
- Conjoined twinning is a rare congenital anomaly.
- It arises from incomplete separation of the embryonic disc after amniotic sac formation.
- This condition presents significant diagnostic and management challenges.
Observation:
- A rare case of dicephalic parapagus conjoined twins was identified.
- Diagnosis was achieved through transabdominal sonography.
- This specific type of conjoined twinning involves duplication of the head and thorax.
Findings:
- Transabdominal sonography is an effective method for diagnosing complex congenital malformations like dicephalic parapagus.
- Early and accurate diagnosis is crucial for planning medical intervention.
- The case underscores the variability and rarity of conjoined twin presentations.
Implications:
- Improved diagnostic accuracy in prenatal sonography can aid in the early detection of rare congenital anomalies.
- Understanding the embryological basis of conjoined twinning informs genetic counseling and management strategies.
- This case contributes to the limited literature on dicephalic parapagus, aiding future research and clinical practice.
Related Concept Videos
Meiosis I
Meiosis is a carefully orchestrated set of cell divisions, the goal of which—in humans—is to produce haploid sperm or eggs, each containing half the number of chromosomes present in somatic cells elsewhere in the body. Meiosis I is the first such division, and involves several key steps, among them: condensation of replicated chromosomes in diploid cells; the pairing of homologous chromosomes and their exchange of information; and finally, the separation of homologous chromosomes by a...
Nondisjunction
Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This produces daughter cells with abnormal chromosome numbers. Nondisjunction is common during anaphase I or anaphase II of meiosis. Mutations in synaptonemal complex proteins that attach homologous chromosomes increase the chances of nondisjunction in anaphase I of meiosis I. In contrast, mutations in topoisomerases and condensins that hold sister...
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...
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...
