Halo sign (chest)
Updates to Article Attributes
Body
was changed:
The halo sign 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 the 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 the 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
- pulmonary infarction
- granulomatosis with polyangiitis
- eosinophilic lung disease
- pulmonary endometriosis
- organising pneumonia
- hypersensitivity pneumonitis
- iatrogenic injury
- pulmonary pseudoaneurysm
See also
- halo sign (breast)
- halo sign (ultrasound)
- reversed halo sign (atoll sign)
- +<li><a title="Pulmonary infarction" href="/articles/pulmonary-infarction-1">pulmonary infarction</a></li>
Images Changes:
Image 6 CT (lung window) ( create )
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