Date: 26 November 2013
Halo sign in IPA
Copyright: n/a
Notes:
CT scan of a neutropenia patient with leukaemia who has 2 lesions. One, on the right, is nodular, abuts on the pleura and is surrounded by a (grey) low attenuation area, referred to as the “halo” sign. This is virtually only seen in invasive fungal infections of the lung, especially early in the course of the disease, during neutropenia. The other lesion visible on this scan, posteriorly on the left, is also typical of invasive pulmonary aspergillosis in that it is pleura-based and has sharply angulated sides typical of vascular invasion and infarction of small lung segments. There is the suggestion of a “halo” sign anteriorly, but there is less confidence in this appearance (compared with the other) because it is only on one side of the lesion.
Images library
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Title
Legend
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Allergic Aspergillus Sinusitis -Patient AM. D – Marked involvement of ehmoidal air cells on the right , together with the inferior aspect of the sphenoid sinus. The left side is almost clear of disease.
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Further details
Image 1. The chest x-ray shows extensive bilateral nodular disease, most consistent with a fungal infection, or possibly tuberculosis. He was treated with a bucket face mask with 80% oxygen and voriconazole.
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A Colonies on MEA +20 % sucrose after 2 weeks; B ascomata, x 40; C conidiophore of Aspergillus glaucus x 920;D conidiophore of Aspergillus glaucus x920 E. portion of ascoma with asci x 920. F ascospores x2330.
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Scanning electron micrographs of A. fumigatus conidia of transformants rodB-02 (b). Size bar, 100 nm.
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Scanning electron micrographs of A. fumigatus conidia of the wild-type G10 strain (a). Size bar, 100 nm.
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Scanning electron micrographs of A. fumigatus conidia of rodA rodB-26 (d).Size bar, 100 nm.
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