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Related Experiment Videos

Pitfall in pigmentation: pseudopods in the nail plate.

Norbert Haas1, Beate-Maria Henz

  • 1Department of Dermatology, Medical Faculty (Charité), Humboldt-University Berlin, Berlin, Germany. norb.haas@charite.de

Dermatologic Surgery : Official Publication for American Society for Dermatologic Surgery [Et Al.]
|November 2, 2002
PubMed
Summary

Pseudopods in nail pigmentation are caused by trapped blood cells. This finding aids in differentiating nail hemorrhage from melanoma using dermoscopy.

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Area of Science:

  • Dermatology
  • Oncology
  • Pathology

Background:

  • A patient presented with an uncommon nail plate pigmentation characterized by pseudopod formation.
  • This case highlights an unusual presentation requiring further diagnostic clarification.

Observation:

  • Dermoscopic examination of the nail was performed.
  • A control biopsy was utilized for histological analysis.

Findings:

  • Pseudopods observed in the nail were identified as erythrocytes entrapped within the nail plate layers.
  • Histological examination confirmed the presence of trapped erythrocytes as the cause of pseudopod formation.

Implications:

  • Nail pseudopod formation may serve as a valuable dermoscopic criterion.

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  • Distinguishing between nail apparatus hemorrhage and melanoma can be improved with this diagnostic marker.