Half-and-half nail: Typical and atypical cases

Introduction. The term 'half-and-half nail' applies to dyschronic changes detected on finger and toe nails of uraemic patients. Subjects. The authors describe 3 subjects: one, is under haemodialysis, with typical half-and-half nails; the second is nonuraemic with only one kidney, and the third has no renal problems. Comment. These cases allow the authors to discuss the clinical and etiopathogenetic aspects of such a condition. The absence of renal failure in two of our patients is the major finding observed.