Nails

• koilonychia
  31 July

  WKP
  Definition : Koilonychia, also known as spoon nails, refers to abnormally thin nails (usually of the hand) which have lost their convexity, becoming flat or even concave in shape. In early stages, nails may be brittle and chip or break easily.
  Etiology
  hypochromic anemia iron-deficiency anemia
  Plummer–Vinson syndrome
  lichen planus
  syphilis
  rheumatic (...)

• melanonychia
  21 September 2021

  Types
  diffuse melanonychia
  longitudinal melanonychia
  Etiology
  fungal melanonychia
  See also
  ungueal anomalies

• matrical tumors
  28 September 2020

  Definition : Matrical tumors are a diverse group of neoplasms composed of cells with matrical differentiation.
  Examples
  onychomatricoma
  onychocytic matricoma localized thickening of the nail plate that may display concurrent melanonychia represents a benign acanthoma of onychocytes
  See also
  cutaeneous tumors
  nails

• onychocytic matricoma
  28 September 2020

  Definition : Onychocytic matricoma typically presents as a localized thickening of the nail plate that may display concurrent melanonychia and represents a benign acanthoma of onychocytes.
  see also
  matrical tumors
  Openreferences
  Alors amygdale végétation tumorectomie sein sans

• nail psoriasis
  13 December 2019

  ungeal psoriasis
  Definition : Psoriasis is the skin disease that most frequently affects the nails. Depending on the very nail structure involved, different clinical nail alterations can be observed.
  Irritation of the apical matrix results in psoriatic pits. Mid-matrix involvement may cause leukonychia. Whole matrix affection may lead to red lunulae or severe nail dystrophy. Nail bed involvement may cause salmon spots , subungual hyperkeratosis , and splinter hemorrhages. Psoriasis of (...)

• nail plate
  13 December 2019

  The keratin is the main component of the nail plate, which is also the largest and most exposed part of the nail apparatus. However, a complex structure that exists underneath the nail plate can exhibit many pathologic conditions.
  The nail plate is mainly produced by the nail matrix trough matrical keratinization.
  The nail matrix is made of epithelial bulbs that are oriented backwards. It is thought that this orientation is responsible for the oblique, rather than vertical, growth of the (...)

• nail matrix
  13 December 2019

  matrix unguis , keratogenous membrane , nail matrix , or onychostroma
  The matrix is the tissue (or germinal matrix) which the nail protects.
  The matrix produces cells that become the nail plate.

• nail
  25 March 2019

  Adj. ungueal WKP
  Definition : A nail is a horn-like envelope covering the tips of the fingers and toes in most primates and a few other mammals. Nails are similar to claws in other animals. Fingernails and toenails are made of a tough protective protein called alpha-keratin. This protein is also found in the hooves and horns of different animals.
  The nail consists of :
  the nail plate
  the nail matrix
  the nail bed below it,
  the grooves surrounding it.
  The nail unit (...)

• median nail dystrophy
  31 March 2017

  Images
  Median nail dystrophy : parakeratosis and accumulation of melanin in nail bed keratinocytes https://twitter.com/JJSpeiserMD/status/846712238689959942

• fungal melanonychia
  21 March 2017

  Images
  longitudinal melanonychia https://twitter.com/JAADjournals/status/844174360533520384
  See also
  melanonychia melanocytic melanonychia subungueal melanoma

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