In other cases, there is a loss of functional thyroid tissue for unknown reasons, a condition known as
idiopathic thyroid atrophy (Gosselin et al., 1981).
Dogs which have low T4, increased cTSH and are negative for TgAA are considered to have
idiopathic thyroid disease.
In the dog, hypothyroidism is usually caused by one of two diseases: lymphocytic thyroiditis or
idiopathic thyroid gland atrophy.
Idiopathic thyroid gland atrophy is also poorly understood.
If so, it's caused by lymphocytic thyroiditis or
idiopathic thyroid atrophy:
Not exact matches
Some mothers have what are called «autoimmune diseases», such as
idiopathic thrombocytopenic purpura, autoimmune
thyroid disease and many others.
Idiopathic means that no one knows what causes it, and in idiopathic hypothyroidism, the dog's thyroid gland simply stops producing
Idiopathic means that no one knows what causes it, and in
idiopathic hypothyroidism, the dog's thyroid gland simply stops producing
idiopathic hypothyroidism, the dog's
thyroid gland simply stops producing hormones.
In the other half of primary hypothyroid cases, a specific cause of
thyroid gland damage can not be found; these cases are known as
idiopathic follicular atrophy in which the hormone - producing cells (follicles) of the
thyroid gland waste away (or atrophy) for an unknown (i.e.
idiopathic) reason.
Thyroiditis (Inflammation of
thyroid gland) &
idiopathic atrophy (no growth in gland due to a pathogen of the
thyroid gland are two main reasons for impairment in the
thyroid gland function or secretions.
In the case of
idiopathic atrophy, when the body is fighting a toxin, foreign body, virus or bacteria, the body's response (called a cell medicated immunity or lymphatic response) also reduces the the activity of growth hormones such as those released by the
thyroid.
Idiopathic atrophy of the
thyroid gland is characterized histologically by loss of
thyroid parenchyma and replacement by adipose tissue.
The two most common causes of adult - onset primary hypothyroidism in dogs include lymphocytic thyroiditis and
idiopathic atrophy of the
thyroid gland.