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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High resolution CT scan images with reconstruction of 1mm thick slices at approximately 10mm increments. The scan shows moderately severe multi-lobar cylindrical and varicose bronchiectasis predominantly centrally and in the upper lungs. There is no mucus plugging seen.
The features are in keeping with allergic bronchopulmonary aspergillosis
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pt.SB – 6/10/98 – bronchocentric granulomatosis. CT scan showing multiple small nodules of variable size in both lung fields, apparently close to the vascular bundles.
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Bronchial oedema.Remarkably oedematous bronchial mucosa, as seen in ABPA.
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An example of longstanding allergic bronchopulmonary aspergillosis in a patient who has been steroid dependent for over 15 years showing remarkable kyphoscoliosis and honey combing and fibrosis of both lungs.
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Recurrent pulmonary shadows 1. 6 Jan 1988 – chest radiograph showing right hilar enlargement, consistent with ABPA.
Recurrent pulmonary shadows 1. 3 Feb 1989 – chest radiograph showing right upper-lobe consolidation and contraction consistent with obstruction of RUL bronchus, in ABPA.
Clearing of pulmonary shadows 3, pt BJ. 5 April 1989 – resolution of shadows seen in February, with a course of corticosteroids.
Recurrence of pulmonary shadows 4, pt BJ. 2 September 1989 – recurrence of pulmonary shadows with an exacerbation of ABPA.
Central bronchiectasis, pt BJ. CT scan of thorax October 1989 showing central bronchiectasis, characteristic of ABPA (and cystic fibrosis).
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