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Accessory Structures of the Skin: Nails01:05

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Nails are one of the important accessory structures of the skin. They are hard, protective structures that cover the dorsal surface of the distal phalanges of fingers and toes. Nails are composed of specialized keratinized cells and serve various functions, including protection, sensation, and manual dexterity.
The main components of a nail include the following.
Nail Plate: The nail plate is the visible portion of the nail that extends beyond the fingertips or toes. It is a hard, translucent...
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Diagnosis using nail matrix.

Bertrand Richert1, Marie Caucanas1, Josette André1

  • 1Dermatology Department, University Hospitals Brugmann, St Pierre and Queen Fabiola's Children Hospital, Université Libre de Bruxelles, Brussels, Belgium.

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Diagnosing nail matrix diseases relies on understanding nail matrix anatomy and function. Recognizing clinical signs helps identify proximal or distal matrix issues, aiding in diagnosis and surgical risk assessment.

Keywords:
ChromonychiaLeukonychiaNail diseaseNail matrixNail plate dystrophy

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Area of Science:

  • Dermatology
  • Nail Biology
  • Pathology

Background:

  • Nail matrix diseases require specialized diagnostic knowledge.
  • Understanding nail matrix function and anatomy is crucial for accurate diagnosis.
  • Clinical manifestations of nail matrix disease vary based on insult characteristics.

Purpose of the Study:

  • To elucidate the relationship between nail matrix insult and clinical presentation.
  • To provide a diagnostic framework for nail matrix diseases based on observable nail signs.
  • To correlate specific nail features with proximal or distal matrix involvement.

Main Methods:

  • Review of clinical manifestations of nail matrix diseases.
  • Correlation of nail signs with location (proximal vs. distal) and nature of matrix insult.
  • Categorization of nail surface irregularities and chromonychia based on etiology.

Main Results:

  • Proximal matrix insults manifest as surface irregularities (lines, roughness, pitting, brittleness).
  • Distal matrix insults present with longitudinal or transverse chromonychia (nail discoloration).
  • Specific clinical signs are linked to the intensity, duration, and extent of the insult.

Conclusions:

  • Nail matrix disease diagnosis is achievable through careful observation of nail surface and color changes.
  • Clinical signs provide valuable clues to the location and nature of the underlying matrix pathology.
  • Knowledge of nail matrix function and anatomy is essential for effective clinical assessment and management.