secondary hypothyroidism

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deficiency of thyroid gland activity, with underproduction of thyroxine, or the condition resulting from it. In its severe form it is called myxedema and is characterized by physical and mental sluggishness, obesity, loss of hair, enlargement of the tongue, and thickening of the skin. In children the condition is known as cretinism. Called also athyria. adj., adj hypothy´roid.
pituitary hypothyroidism secondary hypothyroidism caused by a defect or lesion of the pituitary gland that interferes with production of thyrotropin; the majority of cases are caused by tumors.
primary hypothyroidism hypothyroidism due to disease of the thyroid gland itself, usually accompanied by increased levels of thyrotropin.
secondary hypothyroidism that caused by thyrotropin deficiency.

sec·on·dar·y hy·po·thy·roid·ism

hypothyroidism that arises as a consequence of inadequate thyrotropin secretion by the anterior pituitary gland.


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.
References in periodicals archive ?
4] Graves disease High High High Multinodular goiter High High High Hyperthyroidism in High High High pregnancy Subacute thyroiditis High, normal High, normal High, normal Trophoblastic tumors High High High T3 toxicosis Normal High Normal Neonatal hyperthyroidism High High High Primary hypothyroidism Low Low, normal Low Secondary hypothyroidism Low Low Low Tertiary hypothyrodism Low Low Low Euthyroid sick syndrome Low, normal Low Low, normal Laboratory evaluation of thyroid function Pathological condition [FT.

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