PubMed · 14019188
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A CASTELLANI. 1962. Miscellaneous mycological notes.. https://pubmed.ncbi.nlm.nih.gov/14019188/
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BACKGROUND: 83 Malassezia strains (65 wild isolates and 18 reference strains) were differentiated to the species level using conventional methods including morphological and biochemical features. These strains were further analyzed by Fourier transform infrared spectroscopy (FT-IRS). RESULTS: FT-IRS analysis allowed a clear separation of Malassezia strains according to species-specific cluster formation. The main differences were found between Malassezia furfur and other Malassezia species. In addition, within the species Malassezia furfur, a separation in two similar groups could be demonstrated. A disadvantage of FT-IRS is the relatively expensive apparatus. A great advantage is the speed and simplicity of the procedure, producing results within minutes. CONCLUSION: In pityriasis versicolor, Malassezia globosa was the dominant species found in 62% of cases. In addition, Malassezia furfur was found in 60% of dandruff cases.
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Seborrheic keratoses (SK) are one of the most common benign tumors of the skin. Studies have suggested that human papillomavirus or a benign clonal proliferation of epidermal cells is involved in the pathogenesis of some SK's, however, this issue remains to be resolved. Pityrosporum ovale has been implicated in the pathogenesis of seborrheic dermatitis, however, its potential role in association with SK's has not been evaluated as evidenced by the fact that there are no publications in the English-language literature regarding this issue. We observed a common occurrence of Pityrosporum organisms in the stratum corneum of SK on routine histopathologic sections and decided to investigate whether there was an association between these two common entities. We found that in a majority of the SK studied Pityrosporum was present, which was significantly different from controls (verruca vulgaris and basal cell carcinoma).