1. CHEST IMAGING : CH 12

6. Transverse CT scan obtained in a 60-year-old man with Bronchioloalveolar carcinoma: Multiple nodules surrounded by a halo of ground glass opacity.

7. Pulmonary lymphoma in a 35-year-old man with a history of acute respiratory failure. Theses sections CT shows multiple masses and nodules with a surrounding halo of ground glass opacity in both lungs.

8. A girl, 16 years-old, LAM4, 2 parenchymal nodules surrounded by ground-glass attenuation. Aspergillus antigenemia was positive. The diagnosis retained : Invasive pulmonary aspergillosis.

9. 15 years-old, LAM4, febrile neutropenia, dry cough A- Thin sagittal reconstruction: The Air crescent sign B - coronal reconstruction: The CT halo sign Invasive pulmonary aspergillosis

10. 23 years-old, Hodgkin lymphoma, control after 4 cures of chemotherapy. Multiple parenchymal nodules surrounded by ground-glass attenuation. Pulmonary Candidiasis

11. BOOP in a 48-year-old man who consults for hemoptysis when he stopped steroids. These sections CT demonstrates multiple masses with the CT halo sign in the right lung field.

18. Major causes of pulmonary morbidity and mortality in the immunocompromised host. These viruses may cause interstitial pneumonia, haemorrhagic nodules, and diffuse alveolar damage, and predominantly show areas of ground glass attenuation and/or focal areas of consolidation. Nodules with the CT halo sign are rarely present.

27. Table.: List of diseases showing the CT halo sign