Mould Identification: A Virtual Self Assessment
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Unknown 9 = Phaeoacremonium parasiticum
Case History: A 56-year-old market gardner presented with a eight week history of multiple subcutaneous nodules around his right the ankle and foot. Septate fungal hyphae were seen on direct microscopy of pus and by histopathology of biopsy material. and the culture shown below was isolated.
Direct Microscopy : (PAS staining)
PAS stained smear of pus from a subcutaneous abscess of the foot showing septate hyphal elements consistent with Phaeoacremonium parasiticum.
Culture:
usually slow growing, suede-like with radial furrows, initially whitish-grey becoming olivaceous-grey with age.
Microscopy:
Hyphae hyaline, later becoming brown and some becoming rough walled.
Phialides are brown, thick walled, slender, acular to cylindrical, slightly tapering towards the tip, 15-50 um long, often proliferating, with small, funnel-shaped collarettes.
Conidia often in balls are hyaline, thin-walled, cylindrical to sausage-shaped, 3-6 x 1-2 um, later inflating.
Phialides are thick walled, slender, acular to cylindrical, slightly tapering towards the tip, 15-50 um long, with small, funnel-shaped collarettes.
Comment:
Phaeoacremonium parasiticum [=Phialophora parasiticum] is a plant pathogen but it has also been reported from cases of subcutaneous infection, arthritis, mycetoma, endocarditis and mycotic keratitis.
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