Many of the nail diseases that disrupt nail formation and structure cause secondary brittleness and fragility. In this chapter only those conditions leading to nail fragility or brittleness as a major sign are considered in any detail (Figures 6.1-6.7).
'Hapalonychia' is the term used for cryptogenic soft nail—cases for which there is no primary specific local nail disease to explain the change. Diseases and conditions associated with this include:
congenital types sulphur deficiency syndromes
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