Mould Identification: A Virtual Self Assessment
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Unknown 18 = Exophiala dermatitidis
Case History: A 60 year-old male presented with a subcutaneous lesion on the sole of his right foot. A single draining sinus was present which yielded several black grains.Cultures grew the fungus shown below.
Culture: note good growth at 40C.
An initial yeast-like phase is characterized by unicellular, ovoid to elliptical, budding yeast-like cells. With the development of mycelium, flask-shaped to cylindrical annellides are produced. Spherical phialiees with large, fragile collaretts may also be present (not seen in this strain). Conidia are hyaline to pale brown, one-celled, round to obovoid, 2.0-4.0 x 2.5-6.0 um, smooth-walled and accumulate in slimy balls (glioconidia) at the apices of the phialides or down their sides.
Exophiala dermatitidis (= Wangiella dermatitidis) has been isolated from plant debris and soil and is a recognized causative agent of mycetoma and phaeohyphomycosis in humans. Clinical manifestations include subcutaneous cystic lesions, endocarditis and brain abscesses. E. dermatitidis is neurotropic and cerebral infections are frequently seen.