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Mould Identification: A Virtual Self Assessment

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Unknown 6 = Trichophyton soudanense

Case History
A 10 year old caucasian boy presented to the Dermatology Clinic with a keion lesion of the scalp which had taken about 8 weeks to develop. Direct microscopy showed the presence of fungal elements and the culture shown below was isolated.
Clinical Presentation

Kerion is perhaps an uncommon clinical presentation for this anthrophophilic dermatophyte but it was obviously a fungal infection from the direct microscopy.
Direct Microscopy of Hair

Showing endothrix hair infection.
Culture

Cultures were slow growing, flat to folded, suede-like and a deep apricot orange in colour.
Microscopy
Microscopic view

Microscopy showing reflex branching hyphae, no conidia were seen.
Comment: Trichophyton soudanense is an anthropophilic dermatophyte which is a frequent cause of tinea capitis in Africa. Invaded hairs show an endothrix infection but do not fluoresce under Wood's ulta-violet light. Although distribution is mainly in Africa, increasing numbers of cases are now being seen in countries like Australia, USA and Europe due to immigration.

About Trichophyton Back to Virtual Assessment

What is your identification?

Microsporum canis
Trichophyton soudanense
Trichophyton tonsurans

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Dr David Ellis
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