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congenital hypothyroidism

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hypothyroidism
deficiency of thyroid gland activity, with underproduction of thyroxine, or the condition resulting from it. Common in adult dogs, particularly certain breeds, as a result of an idiopathic atrophy of the thyroid or a lymphocytic thyroiditis. Alopecia, weight gain, mental dullness, fatigue, cold intolerance, infertility and neurological deficits are seen. In food animals the syndrome is classical neonatal colloid goiter. See also goiter.

autoimmune hypothyroidism
see lymphocytic thyroiditis.
congenital hypothyroidism
results from congenital thyroid dysgenesis, defective hormone synthesis or severe iodine deficiency. There is dwarfism, macroglossia and mental dullness.
iatrogenic hypothyroidism
may follow treatment for hyperparathyroidism in cats.
juvenile hypothyroidism
congenital hypothyroidism (above).
primary hypothyroidism
that resulting from disease of the thyroid glands.
secondary hypothyroidism
caused by a deficiency of thyroid-stimulating hormone, usually as a result of a lesion in the pituitary gland.
tertiary hypothyroidism
caused by a lack of synthesis or release of thyrotropin releasing hormone.

congenital hypothyroidism
Congenital myxedema, cretinism Hypothyroidism of neonatal onset, which occurs in 1/±7000 births, more commonly in ♀, characterized by mental and physical retardation due to inappropriate thyroid development or inadequate maternal intake of iodine during gestation. See Myxedema.


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Every newborn baby should be given a heel prick test within days of their birth, checking for life-threatening diseases including cystic fibrosis, sickle cell disease and congenital hypothyroidism.
For years newborn screening consisted of a combination test for PKU, galactosemia, hemoglobinopathies, and congenital hypothyroidism.
One particularly well published survey of 162 confirmed hypothyroid dogs showed the following common findings: · 88% had some kind of skin abnormality · 40% had hair loss (often this starts on the tail leading to a "rat tail" appearance or a bald area around the collar is created) · 22% had skin infection (often dogs are scaly and smelly due to an excessively oily coat) Hypothyroidism in children One in 4,000 babies is born with congenital hypothyroidism.
 
 
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