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Mould Identification: A Virtual Self Assessment

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Unknown = Trichophyton concentricum

Case History
A immigrant from Papua New Guninea presented with several chronic non-inflamatory skin lesions on his back. The fungus shown below was isolated.
Clinical Presentation

Chronic non-inflammatory lesions in inhabitants of Papua New Guinea caused by T. concentricum showing characteristic concentrically arranged imbricated rings of scaling.
Culture

Culture of T. concentricum on mycobiotic agar showing a slow growing, glabrous, deeply folded thallus ranging from cream to deep orange-brown in colour.  Reverse is buff to brown in colour.
Microscopy

Typical "balloon-shaped' chlamydoconidia of T. concentricum.   Microscopic morphology of T. concentricum consists of broad, much-branched, irregular hyphae, which may have "antler" tips resembling T. schoenleinii.  Chlamydoconidia are often present in older cultures. RG-2 organism.
Comments: Trichophyton concentricum is an anthropophilic fungus which causes chronic widespread non-inflammatory tinea corporis known as tinea imbricata because of the concentric rings of scaling it produces. It is not known to invade hair. Infections among Europeans are rare. Distribution is restricted to the Pacific Islands of Oceania, South East Asia and Central and South America.

About Trichophyton Back to Virtual Assessment

What is your identification?

Trichophyton schoenleinii
Trichophyton concentricum
Trichophyton verrucosum

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Dr David Ellis
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