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Unknown 74 = Phialophora verrucosa
Clinical presentation: Chronic verrucous chromoblastomycosis of the hand. Note tissue hyperplasia forming a white verrucoid cutaneous lesion. In Australia, chromoblastomycosis occurs mostly on the hands and arms of timber and cattle workers in humid tropical forests.
Direct microscopy: Skin scrapings from a patient with chromoblastomycosis mounted in 10% KOH and Parker ink solution showing characteristic brown pigmented, planate-dividing, rounded sclerotic bodies.
Culture: Colonies of Phialophora verrucosa are slow growing, initially dome-shaped, later becoming flat, suede-like and olivaceous to black in colour.
Microscopy: Phialides of Phialophora verrucosa are flask-shaped or elliptical with distinctive funnel-shaped, darkly pigmented collarettes. Conidia are ellipsoidal, smooth-walled, hyaline, mostly 3.0-5.0 x 1.5-3.0 μm, and aggregate in slimy heads at the apices of the phialide. RG-2 organism.
Comment: Phialophora verrucosa is a well documented causative agent of chromoblastomycosis, and mycetoma. It produces characteristic flask-shaped phialides with distinctive funnel-shaped, darkly pigmented collarettes. Environmental isolations have been made from plant debris, wood piles, fence posts, tree stumps, soil and animal faeces.
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