Anetoderma
- Author: Anne Elizabeth Laumann, MBChB, MRCP(UK), FAAD; Chief Editor: Dirk M Elston, MD more...
Background
Anetoderma (anetos, Greek for slack) is a benign condition with focal loss of dermal elastic tissue, resulting in localized areas of flaccid or herniated saclike skin. The condition has been reported under various names, including macular atrophy and dermatitis atrophicans maculosa.
Historically, idiopathic lesions were classified based on a clinically inflammatory (Jadassohn-Pellizzari) or noninflammatory (Schweninger-Buzzi) onset. However, both types of lesions may be found in the same patient, and they are histologically similar. Currently, anetoderma is classified as either primary anetoderma, which is an idiopathic occurrence of atrophic lesions in areas of skin that appear normal prior to the onset of atrophy, or secondary anetoderma, which is preceded by an inflammatory or other skin pathology in the same location. Both types may be associated with systemic diseases.
Pathophysiology
The exact cause of anetoderma is unknown. Possible explanations for loss of elastic tissue include defective elastin synthesis, uncontrolled production of elastolytic enzymes, loss of elastolytic enzyme inhibitors, elastophagocytosis, or degeneration of elastic fibers secondary to local ischemia induced by microthromboses in dermal vessels.[1] Some investigators have proposed a possible common epitope between elastic fibers and phospholipids as an explanation for an autoimmune-mediated process.[1]
Elastolytic activity has been shown in matrix metalloproteinases (MMPs),[2] cathepsins, and elastases. Inflammatory cells (macrophages and neutrophils) are the most important producers of these enzymes. Many different proinflammatory stimuli can cause them to produce elastolytic enzymes. These stimuli include, but are not limited to, the deposition of autoimmune complexes, infections, hypoxia/re-oxygenation, and physiochemical injuries.
Elastolytic enzymes may be directly responsible for elastin degradation. Alternatively, they may act indirectly by modulating other inflammatory events, such as proteolytic activation of latent cytokines, which, in turn, may regulate the activity of other undiscovered elastolytic enzymes. Known elastolytic enzyme inhibitors include serine proteinase inhibitors (serpins) and tissue inhibitors of metalloproteinase (TIMPs). An imbalance of the elastolytic enzymes and their inhibitors may change the rate of elastin turnover in affected areas, resulting in the visible lesions.
Epidemiology
Frequency
United States
The exact incidence of anetoderma is not known, but secondary anetoderma is probably more common than the primary form. Familial anetoderma is uncommon, with only 12 families reported in the literature.[3, 4, 5, 6] Inheritance may be autosomal dominant, autosomal recessive, or undefined.
International
Secondary anetoderma may be more frequent in Central Europe than in North America, paralleling the incidence of acrodermatitis chronica atrophicans. This suggests that Borrelia species may be involved.
Mortality/Morbidity
Primary anetoderma is usually asymptomatic and not associated with mortality.
Sex
Primary anetoderma occurs slightly more frequently in women than in men.
Age
Most patients with primary anetoderma present between the second and fourth decade of life, although much younger[7, 8, 9] and older ages of onset have been reported.
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