"Osler's sign": pretibial myxedema of Graves' disease.
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The authors report a case of tibial-tarsal septic arthritis caused by a Group A Beta Haemolytic Streptococcus. The primitive pathologic process was an erysipelas with an unusual localization originally of difficult interpretation.
General and specific cutaneous findings associated with hyperthyroidism are reviewed. Familiarity with these findings may aid the practitioner in the early diagnosis of thyroid diseases. Several normally idiopathic cutaneous diseases can occasionally be controlled if underlying thyroid disease is considered as a cause, and appropriate testing performed.
A 37-year-old female patient from Indonesia is reported, who developed pigmentary demarcation lines during the last trimenon of her first pregnancy. The lines resolved spontaneously after delivery.
Elastic fibers account for 2% of dermal volume and are responsible for normal skin resiliency. We investigated a disorder of the dermal elastic component as the mechanism for the decreased elasticity of skin in myxedema. Skin biopsy specimens were obtained from patients with thyroid diseases and normal subjects matched for age, sex, and biopsy location. Elastic fiber concentration, determined by computerized morphometric analysis of Verhoeff-van Gieson-stained sections, was significantly lower than normal in hypothyroid and pretibial myxedema. The decreased elastin concentration was not a consequence of the glycosaminoglycan infiltration. Ultrastructural studies of myxedematous skin showed wide variability of elastic fiber diameter and decreased microfibrils. Myxedema (hypothyroid and pretibial) is consistently associated with quantitative and qualitative defects of dermal elastic fibers.
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Pretibial myxedema is a localized dermopathy seen in patients with past or present hyperthyroidism. Massive intradermal deposition of mucin (acid mucopolysaccharide) produces the classic indurated nodules or plaques on the anterior lower legs. Most patients have elevated levels of LATS in their serum; however, this appears to be a marker for the disease, rather than a cause. Mild pretibial myxedema requires no treatment. Topical, intralesional or systemic steroids may be useful in severe cases.
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Mycobacterium chelonei is a facultative pathogen which exists as a saprophyte in the environment and rarely produces clinical manifestations in humans. We describe a 62-year-old woman, long-term treated with low-dose steroids for severe asthma, who presented sporotrichoid-like lesions on one leg. These lesions appeared two months after a cat-scratch and were present for six months. Histological examination showed acute inflammation with polymorphonuclear infiltration without tuberculoid granuloma nor caseation necrosis. Ziehl-Neelsen stains were negative. Mycobacteria were found by direct examination and Mycobacterium chelonei chelonei was identified by culture. Treatment with isoniazid, rifampicin and ethambutol was given for one month and followed by complete resolution of the lesions, though each of these antibiotics was not effective in vitro. The literature about Mycobacterium chelonei infections is reviewed and the role of the antibiotherapy in clinical recovery is discussed.
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This article has attempted to alert the podiatric medical practitioner to those endocrine disorders which have pedal manifestations. With the clinical information presented here, the podiatrist is in a unique position to identify early signs of endocrine disease. By doing so, the podiatric practitioner may play a vital role as a member of the primary care team.
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