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CT halo sign: the spectrum of pulmonary diseases

Department of Diagnostic Radiology, College of Medicine, Hanyang University, 17 Haengdang-dong, Sungdong-gu, Seoul 133-792, Korea

View larger version (108K): [in a new window]   Figure 1. Invasive pulmonary aspergillosis in a 39-year-old man with acute myelogenous leukaemia and neutropenia. Thin-section CT at the level of the lung apex shows multiple nodules surrounded by a halo of ground glass opacity in both upper lobes.

View larger version (156K): [in a new window]   Figure 2. Cytomegalovirus pneumonia in a 45-year-old woman with rapidly progressive glomerulonephritis. Thin-section CT of the right lung base demonstrates multiple tiny nodules (arrows) with the CT halo sign in the right lower lobe.

View larger version (74K): [in a new window]   Figure 3. Kaposi sarcoma in a 29-year-old woman with a history of renal transplantation. Thin-section CT at the level of the carina shows multiple nodules with a surrounding halo of ground glass opacity in both lungs, which are dissimilar to flame-shaped lesions, the classic findings of Kaposi sarcoma.

View larger version (143K): [in a new window]   Figure 4. Bronchioloalveolar carcinoma in a 60-year-old woman. Thin-section CT obtained at the level of the bronchus intermedius shows a peripheral pulmonary nodule with the CT halo sign.

View larger version (129K): [in a new window]   Figure 5. Wegener's granulomatosis in a 70-year-old woman. Thin-section CT shows a pulmonary nodule with the CT halo sign in the left lower lobe (thick arrow). Note another nodule in the right middle lobe but without surrounding ground glass opacity (thin arrow) (Courtesy of Kyung Soo Lee, MD, Samsung Medical Center, Seoul, Korea).

View larger version (129K): [in a new window]   Figure 6. Simple pulmonary eosinophilia (Loeffler syndrome) in a 42-year-old man with peripheral eosinophilia (53.5% of eosinophils in the peripheral blood). Thin-section CT shows multiple small nodules (arrows) with a surrounding halo of ground glass opacity in the right lower lobe.