Acrokeratoelastoidosis of Costa

A rare genetic skin disorder

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Diagram of autosomal dominant inheritance

Acrokeratoelastoidosis of Costa is a rare genetic disorder characterized by small, firm papules that appear on the sides of the hands and feet. It is classified as a type of keratoderma, which involves thickening of the skin. This condition is named after the dermatologist who first described it, Costa.

Presentation

The primary feature of acrokeratoelastoidosis of Costa is the presence of small, yellowish papules that are typically 1-3 mm in diameter. These papules are usually found on the palms and soles, particularly along the edges of the hands and feet. The papules are firm and may be slightly elevated, giving the skin a rough texture.

Patients with this condition may experience mild itching or discomfort, but it is generally not painful. The papules tend to appear in childhood or early adulthood and may increase in number over time.

Pathophysiology

Acrokeratoelastoidosis of Costa is believed to be an autosomal dominant disorder, meaning that a single copy of the altered gene in each cell is sufficient to cause the condition. The exact genetic mutation responsible for this disorder has not been identified, but it is thought to involve abnormalities in the elastic fibers of the skin.

The histological examination of affected skin reveals a reduction in elastic fibers and an increase in keratinization, which contributes to the formation of the characteristic papules.

Diagnosis

Diagnosis of acrokeratoelastoidosis of Costa is primarily clinical, based on the appearance and distribution of the papules. A skin biopsy may be performed to confirm the diagnosis and rule out other similar conditions, such as focal acral hyperkeratosis or palmoplantar keratoderma.

Management

There is no specific treatment for acrokeratoelastoidosis of Costa. Management focuses on alleviating symptoms and may include the use of emollients to soften the skin and reduce discomfort. In some cases, keratolytic agents such as salicylic acid or urea creams may be used to reduce the thickness of the papules.

Prognosis

The condition is benign and does not affect overall health or life expectancy. However, the cosmetic appearance of the papules may be a concern for some patients.

Related pages

• Keratoderma
• Palmoplantar keratoderma
• Genetic disorder
• Autosomal dominant