Halo sign (chest)
Updates to Article Attributes
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was changed:
The halo sign (HS) in in chest imaging is a feature seen on lung window settings (typically HRCT), ground glass opacity surrounding a pulmonary nodule or mass and represents haemorrhage. It is typically seen in angioinvasive aspergillosis.
Pathology
Histopathologically, it represents a focus of pulmonary infarction surrounded by alveolar haemorrhage.
Diagnostic considerations
Other entities that may give a halo sign include:
Infectious disease
- fungi
- septic embolism
- mycobacterial
- rickettsia - rickettsia pneumonia
- Coxiella burnetii - Q fever pneumonia
- viral: herpes simplex virus, varicella zoster virus (chicken pox), cytomegalovirus, myxovirus
Neoplasia
- primary tumours
- adenocarcinoma of lung, adenocarcinoma in situ or minimally invasive (formerly bronchioalveolar carcinoma) - has been described as the most commonly encountered with HS in immunocompetent patients 5
- squamous cell carcinoma of lung
- Kaposi sarcoma
- pulmonary lymphoma
-
lung metastases (especially - haemorrhagic pulmonary metastases):
- angiosarcoma
- choriocarcinoma
- osteosarcoma
- melanoma
- metastasis from gastrointestinal adenocarcinoma (<10%)
Non-neoplastic, non-infectious, inflammatory diseases
- granulomatosis with polyangiitis
- eosinophilic lung disease
- pulmonary endometriosis
- organising pneumonia
- hypersensitivity pneumonitis
- iatrogenic injury
- pulmonary pseudoaneurysm
See also
-<p>The <strong>halo sign</strong> (HS) in chest imaging is a feature seen on lung window settings (typically <a href="/articles/hrct">HRCT</a>), <a href="/articles/ground-glass-opacification-1">ground glass opacity</a> surrounding a pulmonary nodule or mass and represents haemorrhage. It is typically seen in <a href="/articles/angioinvasive-aspergillosis">angioinvasive aspergillosis</a>.</p><h4>Pathology</h4><p>Histopathologically, it represents a focus of pulmonary infarction surrounded by alveolar haemorrhage.</p><h4>Diagnostic considerations</h4><p>Other entities that may give a halo sign include:</p><h5>Infectious disease</h5><ul>- +<p>The <strong>halo sign</strong> in chest imaging is a feature seen on lung window settings (typically <a href="/articles/hrct">HRCT</a>), <a href="/articles/ground-glass-opacification-1">ground glass opacity</a> surrounding a pulmonary nodule or mass and represents haemorrhage. It is typically seen in <a href="/articles/angioinvasive-aspergillosis">angioinvasive aspergillosis</a>.</p><h4>Pathology</h4><p>Histopathologically, it represents a focus of pulmonary infarction surrounded by alveolar haemorrhage.</p><h4>Diagnostic considerations</h4><p>Other entities that may give a halo sign include:</p><h5>Infectious disease</h5><ul>
-<li><a title="Granulomatosis with polyangiitis (pulmonary manifestations)" href="/articles/granulomatosis-with-polyangiitis-pulmonary-manifestations-1">granulomatosis with polyangiitis</a></li>- +<li><a href="/articles/granulomatosis-with-polyangiitis-pulmonary-manifestations-1">granulomatosis with polyangiitis</a></li>
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