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Related Experiment Videos

Pityriasis versicolor with a unique clinical appearance.

C Okuda1, M Ito, W Naka

  • 1Section of Dermatology, Saiseikai Sanjo Hospital, Japan.

Medical Mycology
|March 13, 1999
PubMed
Summary

This study details an unusual pityriasis versicolor case with distinct clinical and mycological features. Immunohistochemical and ultrastructural analyses identified Malassezia globosa as the cause.

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Area of Science:

  • Dermatology
  • Mycology
  • Infectious Diseases

Background:

  • Pityriasis versicolor is a common superficial fungal infection.
  • It is typically caused by Malassezia yeasts, predominantly Malassezia globosa and Malassezia furfur.
  • Diagnosis is usually based on clinical presentation and microscopic examination of skin scrapings.

Observation:

  • An atypical case of pityriasis versicolor presented with unique clinical features.
  • Keratotic material yielded Malassezia sp. on culture.
  • However, direct microscopic examination of fungal elements was inconclusive for definitive identification.

Findings:

  • Immunohistochemical and ultrastructural studies were crucial for diagnosis.
  • These advanced techniques confirmed the etiological agent as Malassezia globosa.

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  • This highlights limitations of conventional diagnostic methods in certain cases.

    • Implications:

    • This case expands the understanding of pityriasis versicolor's clinical and mycological spectrum.
    • It underscores the utility of advanced diagnostic modalities in challenging fungal infections.
    • Further research into the variability of Malassezia species in pityriasis versicolor is warranted.