Pachyonychia congenita: Brief appraisal of history and current classification

Palmoplantar Keratoderma and Nail Involvement in an Adult

“…As the correlation between clinical features and genotype is not absolute, the old classification is superseded by the new classification that defines five types based exclusively on the mutation in the keratin gene involved: PC-K6a, PC-K6b, PC-K6c, PC-K16 and PC-K17. [ 3 ]…”