Date: 26 November 2013
cultures grown from BAL fluid showing formation of sclerotia.
Copyright:
Kindly donated by Dr Claudia Venturelli and Dr Giorgia Bertazzoni, Laboratory of Microbiology – Policlinico of Modena-Italy. © Fungal Research Trust
Notes:
These colonies were isolated from a BAL, (also with bacterial qrowth of S.aureus and S.maltophilia) from a patient with a VAP (undergoing corticosteroid treatment). The growth medium used is sabouraud dextrose agar , incubated at 37° C The identification is made by microscopic/macroscopic observation criteria.
Colonies on CYA 60-70 mm diam, plane, sparse to moderately dense, velutinous in marginal areas at least, often floccose centrally, sometimes deeply so; mycelium only conspicuous in floccose areas, white; conidial heads usually borne uniformly over the whole colony, but sparse or absent in areas of floccose growth or sclerotial production, characteristically Greyish Green to Olive Yellow (1-2B-E5-7), but sometimes pure Yellow (2-3A7-8), becoming greenish in age; sclerotia produced by about 50% of isolates, at first white, becoming deep reddish brown, density varying from inconspicuous to dominating colony appearance and almost entirely suppressing conidial production; exudate sometimes produced, clear, or reddish brown near sclerotia; reverse uncoloured or brown to reddish brown beneath sclerotia. Colonies on MEA 50-70 mm diam, similar to those on CYA although usually less dense. Colonies on G25N 25-40 mm diam, similar to those on CYA or more deeply floccose and with little conidial production, reverse pale to orange or salmon. No growth at 5°C. At 37°C, colonies usually 55-65 mm diam, similar to those on CYA at 25°C, but more velutinous, with olive conidia, and sometimes with more abundant sclerotia.
Sclerotia produced by some isolates, at first white, rapidly becoming hard and reddish brown to black, spherical, usually 400- 800 µm diam. Teleomorph not known. Conidiophores borne from subsurface or surface hyphae, stipes 400 µm to 1 mm or more long, colourless or pale brown, rough walled; vesicles spherical, 20-45 µm diam, fertile over three quarters of the surface, typically bearing both metulae and phialides, but in some isolates a proportion or even a majority of heads with phialides alone; metulae and phialides of similar size, 7-10 µm long; conidia spherical to subspheroidal, usually 3.5-5.0 µm diam, with relatively thin walls, finely roughened or, rarely, smooth.
Distinctive features
Aspergillus flavus is distinguished by rapid growth at both 25°C and 37°C, and a bright yellow green (or less commonly yellow) conidial colour. A. flavus produces conidia which are rather variable in shape and size, have relatively thin walls, and range from smooth to moderately rough, the majority being finely rough.
Images library
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Late (venous) phase angiogram of a right intercostal artery showing persistence of vascular blush and further filling of a branch of the pulmonary artery.
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Catheter tip in a right posterior intercostal artery on screening film.
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Angiogram of a right bronchial artery on subtraction film in the early arterial phase showing filling hypervascular circulation superiorly and communications with a pulmonary arterial radical.
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This patient with severe pulmonary sarcoidosis has bilateral aspergillomas. A rim of air is visible around parts of the aspergillomas on both sides. This patient was recruited into the NIAID Mycoses Study Group multicentre study of the treatment of invasive pulmonary aspergillosis with itraconazole but not analysed because invasive disease was not demonstrated. Denning DW, Lee JY, Hostetler JS, Pappas P, Kauffman CA, Dewsnup DH, Galgiani JN, Graybill JR, Sugar AM, Catanzaro A, Gallis H, Perfect JR, Dockery B, Dismukes WE, Stevens DA, NIAID Mycoses Study Group multicenter trial of oral itraconazole therapy of invasive aspergillosis. Am J Med 1994; 97: 135-144
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Extensive pleural thickening is demonstrated at the left apex on this CT scan of a woman who had previously had tuberculosis and whose large cavity gradually became obliterated by pleural thickening. An aspergilloma is demonstrable within the cavity
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This chest radiograph (AMBER film) demonstrates the typical extensive pleural thickening at the right apex, seen in patients with aspergillomas. The cavity appears not to contain an aspergilloma but on CT scan had some ‘debris’ and Aspergillus antibiotics (precipitins) were strongly positive. The differential diagnosis lies between an aspergilloma and chronic invasive pulmonary aspergillosis. The extensive pleural thickening is heavily in favour of an aspergilloma, even without a well demonstrated fungal ball in the cavity.
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Image C. Another example of a severe apical aspergilloma with remarkably little pleural thickening on plain chest radiograph (AMBER film). Severe distortion of the trachea is demonstrated.
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Right apical aspergilloma, patient WC. Plain chest radiograph of patient with right apical aspergilloma in an old, large tuberculous cavity. Severe haemoptysis and respiratory insufficiency together constituted the indications for embolisation which was done in one session over a 3 hour period (see images 1-6).
