Uraemic Half-and-Half Nail
The uraemic half-and-half nail of Lindsay consists of two parts separated more or less transversely by a well-defined line. The proximal area is dull white, resembling ground glass and obscuring the lunula; the distal area is pink, reddish or brown, and occupies between 20% and 60% of the total length of the nail (average 33%). In typical cases the diagnosis presents no difficulty, but in Terry’s nail the pink, distal area may occupy up to 50% of the length of the nail; under these circumstances the two types may be confused. Half-and-half nail may display a normal proximal half, the colour of the distal part being due to an increase in the number of capillaries and thickening of their walls, or melanin granules in the nail bed. Sometimes the distinctly abnormal onychodermal band extends approximately 20–25% from the distal portion of the finger nail as a distal crescent of pigmentation with pigment throughout the brown arc of the nail plate.
Nail changes similar to those reported by Terry, Lindsay and Muehrcke have been termed ‘Neapolitan nails’; they are probably simply a phenomenon of old age in otherwise normal individuals.
Anaemia may produce pallor of the nail (apparent leukonychia), if the haemoglobin level falls sufficiently, similar to mucous membrane and conjunctival pallor.
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Cat: Nail Disorder Picture
Tags : Uraemic
