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Related to primary hypothyroidism: tertiary hypothyroidism
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.
Hypothyroidism due to failure of the thyroid gland to produce metabolically adequate amounts of thyroid hormones. It is the most common form of hypothyroidism.
See also: 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.
see lymphocytic thyroiditis.
results from congenital thyroid dysgenesis, defective hormone synthesis or severe iodine deficiency. There is dwarfism, macroglossia and mental dullness.
may follow treatment for hyperparathyroidism in cats.
congenital hypothyroidism (above).
that resulting from disease of the thyroid glands.
caused by a deficiency of thyroid-stimulating hormone, usually as a result of a lesion in the pituitary gland.
caused by a lack of synthesis or release of thyrotropin releasing hormone.