Unusual location has been arbitrarily defined in the past according to the incidental percentage, to a mathematical index of density, to the literature reports. All these criteria suffer more or less from some discrepancy, but in our opinion all these should be considered for a definition. Our results, moreover, suggest that only the above described sites should be considered.
Multiple CCA is a rare condition; fewer than 20 cases having been described. The presence of associated conditions like dry skin and varicose veins are discussed. Because of the tendency of persistence of the lesions, cryotherapic treatment may be a useful method of therapy.
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