Pretibial myxedema

Source: Wikipedia, the free encyclopedia.
Pretibial myxedema
shins of someone with pretibial myxedema
SpecialtyEndocrinology Edit this on Wikidata

Pretibial myxedema (myxoedema in British English, also known as Graves' dermopathy, thyroid dermopathy,[1] Jadassohn-Dösseker disease or myxoedema tuberosum) is an infiltrative dermopathy, resulting as a rare complication of Graves' disease,[2] with an incidence rate of about 1–5%.

Signs and symptoms

Pretibial myxedema is almost always preceded by the ocular signs found in Graves' disease.[3] It usually presents itself as a waxy, discolored induration of the

dorsum of the feet, or as a non-localised, non-pitting edema of the skin in the same areas.[4] In advanced cases, this may extend to the upper trunk (torso), upper extremities, face, neck, back, chest and ears
.

The

lesions are known to resolve very slowly. Application of petroleum jelly on the affected area could relieve the burning sensation and the itching. It occasionally occurs in non-thyrotoxic Graves' disease, Hashimoto's thyroiditis, and stasis dermatitis. The serum contains circulating factors which stimulate fibroblasts to increase synthesis of glycosaminoglycans
.

Risk factors

There are suggestions in the medical literature that treatment with radioactive iodine for Graves' hyperthyroidism may be a trigger for pretibial myxedema[5] which would be consistent with radioiodine ablation causing or aggravating ophthalmopathy, a condition which commonly occurs with pretibial myxedema and is believed to have common underlying features.[6]

Other known triggers for ophthalmopathy include thyroid hormone imbalance, and tobacco smoking, but there has been little research attempting to confirm these are also risk factors for pretibial myxedema.

Diagnosis

A

fibroblasts. Over time, secondary hyperkeratosis may occur, which may become verruciform. Many of these patients may also have co-existing stasis dermatitis
. Elastic stains will reveal a reduction in elastic tissue.

Management

Many cases of pretibial myxedema, particularly cases that are mild, can be managed without specific pharmacologic treatment; approximately 50% of mild cases achieve complete remission without treatment after several years. When pharmacologic treatment is considered, topical, locally injected, or systemic corticosteroids may be used.[7]

References

External links