Two years ago, in a complete article, Rosenau1 described certain minor and temporary deformities of the nails following rheumatic fever. The changes consisted of small depressions in the body of the nails, varying in size from that of a pinpoint to that of a pinhead. He observed as many as twenty in one nail as they progressed from the lunula to the free edge, when they disappeared. He noticed also transverse furrows and longitudinal grooves in the same disease. These alterations could be related likewise to scarlet fever, Hodgkin's disease, empyema, typhoid fever, trauma and thrombo-angitis obliterans, but by far the greater number occurred after rheumatic fever. They were usually seen immediately after the disease, although occasionally the defects were noticed some years later.
These depressions and furrows are apparently of the same nature as the white spots or flecks which are of every-day occurrence, but definite white striations
WOOLF MS. LEUKONYCHIA STRIATA. Arch Derm Syphilol. 1925;12(4):520–521. doi:10.1001/archderm.1925.02370100057006
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