Dermatology Book

Nail Longitudinal StriationAka: Nail Longitudinal Band, Trachyonychia, 20-nail dystrophy


  1. See Also
    1. Transverse Linear Nail Lesion
    2. Fingernail
    3. Nail Abnormality
    4. Nail Discoloration
  2. Definitions
    1. Trachyonychia
      1. Striations due to aging
      2. Associated with sandpaper appearance to nail
    2. 20-nail dystrophy
      1. Diffuse trachyonychia involving all nails
  3. Causes of diffuse trachyonychia (20-nail dystrophy)
    1. Alopecia Areata
    2. Vitiligo
    3. Psoriasis
    4. Atopic Dermatitis
  4. Specific Types of Longitudinal Lines
    1. Nail Splinter Hemorrhage
    2. Median Nail Groove causes
      1. Habit tics
      2. Self-limiting dystrophy of Heller
    3. Dark pigmented longitudinal lines (Melanonychia)
      1. Normal variant in patients with dark-skin
      2. Subungual Melanoma (also seen with dark-skin)
        1. See Melanonychia
  5. References
    1. Fawcett (2004) Am Fam Physician 69(6):1417

Trachyonychia (C0546956)

ConceptsSign or Symptom (T184)
EnglishBrittle nails, Fragilitas unguium, NAIL BRITTLENESS, Trachyonychia
Spanishfragilidad ungueal, traquioniquia, unas fragiles, unas quebradizas
Parent ConceptsDevelopmental abnormality of nail (C0406437), Duplicate concept (C1274013)
Derived from the NIH UMLS (Unified Medical Language System)

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