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Mould Identification: A Virtual Self Assessment

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Unknown 80 = Trichophyton interdigitale

Case History
A 35-year old male mountain bike rider presented with vesicular scaly lesions with a serous exudate on the sole of his foot.  Nail scrapings were taken.  KOH microscopy was negative, however the culture seen below was isolated.
Clinical Presentation


Colonies are fast growing, suede-like to downy, with a strong yellow to orange-brown diffusable pigmentation. When sporulating numerous black sporodochia (aggregates of conidiophores) are visible.
Culture


Colonies are usually flat, white to cream in colour with a powdery to suede-like surface and yellowish and pinkish brown reverse pigment, often becoming a darker red-brown with age.
Microscopy

Numerous subspherical to pyriform microconidia, occasional spiral hyphae and spherical chlamydospores are present, the latter being more abundant in older cultures. Occasional slender, clavate, smooth-walled, multiseptate macroconidia are also present in some cultures.  RG-2 organism.

Comment:
Trichophyton interdigitale is an anthropophilic fungus which is a common cause of tinea pedis, particularly the vesicular type, tinea corporis, and sometimes superficial nail plate invasion. It is not known to invade hair in vivo but produces hair perforations in vitro. Distribution is world-wide.

About Trichophyton interdigitale Back to Virtual Assessment

What is your identification?

Trichophyton mentagrophytes
Trichophyton quinkeanum
Trichophyton interdigitale

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