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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Falcons: The following images were obtained by endoscopy of falcons with aspergillosis.A,B Thoracic airsac (T) with prominent blood vessels and a dead serratospiculum worm (W). The presence of these lung worms makes the airsac look milky. D Normal ovary with developing follicles.
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Falcons: The following images were obtained by endoscopy of falcons with aspergillosis.B,D Aspergillus lesions (A) over a swollen liver
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Falcons: The following images were obtained by endoscopy of falcons with aspergillosis.B Cranial, middle, caudal lobes (K1,K2,K3) of the left kidney, all the lobes show slight nephromegaly.C Yellow aspergillus colony (A1), lying adjacent to the lung.D White aspergillus colonies (A2,A3,A4).
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Falcons: The following images were obtained by endoscopy of falcons with aspergillosis.C Cranial pole of left kidney (K) -mildly inflamed.D Ovary ( F) with developing follicles.
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The following images were obtained by endoscopy of falcons with aspergillosis.A and B Lung Worm (S) over liver (Li) (serratospiculum seurati)C and D Aspergilloma (A) and prominent blood vessels on the caudal thoracic air sac (T).
