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Teratology is the study of abnormalities of physiological development in organisms during their life span. It is a sub-discipline in medical genetics which focuses on the classification of congenital abnormalities in dysmorphology caused by teratogens and also in pharmacology and toxicology.
Another 10–13% of anomalies have a purely environmental cause (e.g. infections, illness, or drug abuse in the mother). Only 12–25% of anomalies have a purely genetic cause. Of these, the majority are chromosomal anomalies. [96] Congenital disorders are not limited to humans and can be found in a variety of other species, including cattle.
Animal studies have found that androgen antagonists during early fetal development cause elevated rates of hypospadias and cryptorchidism, however, in humans these traits rarely occur together. [15] In addition, levels of circulating testosterone overlap for both male and female fetuses throughout fetal development.
Chromosome 20 abnormalities; Chromosome 22 abnormalities; Cleft lip/palate; Cleidocranial dysostosis; Club foot; Congenital adrenal hyperplasia (CAH) Congenital central hypoventilation syndrome; Congenital diaphragmatic hernia (CDH) Congenital Disorder of Glycosylation (CDG) Congenital hyperinsulinism; Congenital insensitivity to pain with ...
Cyclopia (named after the Greek mythology characters cyclopes), also known as alobar holoprosencephaly, is the most extreme form of holoprosencephaly and is a congenital disorder (birth defect) characterized by the failure of the embryonic prosencephalon to properly divide the orbits of the eye into two cavities.
This category reflects the organization of International Statistical Classification of Diseases and Related Health Problems, 10th Revision. Generally, diseases outlined within the ICD-10 codes Q00-Q99 within Chapter XVII: Congenital malformations, deformations and chromosomal abnormalities should be included in this category.
All forms of portosystemic shunts produce various neurological, gastrointestinal, and urinary symptoms. [3]Symptoms of congenital PSS usually appear by six months of age [4] and include failure to gain weight, vomiting, and signs of hepatic encephalopathy (a condition where toxins normally removed by the liver accumulate in the blood and impair the function of brain cells) such as seizures ...
Sirenomelia, also called mermaid syndrome, is a rare congenital deformity in which the legs are fused together, giving the appearance of a mermaid's tail, hence the nickname. Classification [ edit ]