II. Epidemiology

  1. Normal variant in 90% of black patients
  2. Uncommon in lighter skinned patients

III. Signs

  1. Hyperpigmented longitudinal band
  2. May involve entire length of nail and affect one or multiple nails

IV. Differential Diagnosis

  1. See Melanonychia
  2. See Nail Longitudinal Band
  3. Subungual Melanoma (50% of Melanomas in dark skinned patients)
    1. Critical to distinguish from the benign Vertical Nail Bands

V. Evaluation

  1. Biopsy suspicious Longitudinal Melanonychia

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Ontology: Longitudinal brown stripes in nails (C0423825)

Concepts Finding (T033)
SnomedCT 247506000
English Longitud brown stripes in nail, Longitudinal brown stripes in nails, Longitudinal brown stripes in nails (finding)
Spanish estrĂ­as ungueales marrones longitudinales (hallazgo), estrĂ­as ungueales marrones longitudinales