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Giovannini describes a case of canities unguium in a patient of twenty-nine, following an attack of typhoid fever. On examining the hands of this patient the nails showed in their entire extent a white, opaque, almost ivory color. An abnormal quantity of air found in the interior of the nails explains in this particular case their impaired appearance.
It is certain that the nails, in order to have admitted such a large quantity of air into their interior must have altered in their intimate structure; and Giovannini suggests that they were subject to an abnormal process of keratinization. Unna describes a similar case, which, however, he calls leukonychia.
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