Mould Identification: A Virtual Self Assessment
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Unknown 69 = Aspergillus niger
|A 51-year old, immunocompromised man presented with chronic unilateral otomycosis who had been unresponsive to a variety of treatment regimens. The patient presented with intermittent otalgia and otorrhea and with a perforation of his left tympanic membrane. Debris showed the presence of septate hyphae and the culture below was grown.|
Methenamine silver stained tissue section showing septate hyphae consistent with Aspergillus.
Colonies consist of a compact white or yellow basal felt covered by a dense layer of dark-brown to black conidial heads.
Conidial heads are large (up to 3 mm x 15-20 um in diameter), globose, dark brown, becoming radiate and tending to split into several loose columns with age. Conidiophores are smooth-walled, hyaline or turning dark towards the vesicle. Conidial heads are biseriate with the phialides borne on brown, often septate metulae. Conidia are globose to subglobose (3.5-5.0 um in diameter), dark brown to black and rough-walled. RG-1 organism.
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