Mould Identification: A Virtual Self Assessment
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Unknown 63 = Trichophyton schoenleinii
|A 20 year man presented with a lesion of the scalp showing hair loss and several small scutula. Skin scales were collected for microscopy and culture.|
Favus of the scalp caused by T. schoenleinii showing extensive hair loss and numerous small scutula.
Cultures of T. schoenleinii are waxy or glabrous with a deeply folded honeycomb-like thallus with some sub-surface growth. The thallus is cream coloured to yellow to orange brown. Cultures are difficult to maintain in convoluted form and rapidly become flat and downy. No reverse pigmentation is present.
Microscopic morphology of T. schoenleinii showing characteristic antler "nail head" hyphae also known as 'Flavic chandeliers". No macroconidia or microconidia are seen in routine cultures, however, numerous chlamydoconidia may be present in older cultures. RG-2 organism.
Distribution: Eurasia and Africa.
Key Features: Culture characteristics, microscopic morphology showing favic chandeliers and clinical disease.
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