ABSTRACT
Transverse striate leukonychia (white lines in transverse direction on nails)
Result from disruption of nail plate keratinization Occur 2 to 3 weeks after acute arsenic ingestion. Also occur in chronic poisonings
Distance from Mees’ lines to the nail fold can be used to estimate the time since exposure
Also may occur from poisoning with thallium, lead, sulfonamides, pilocarpine, and chemotherapy and from stress of severe systemic illness
