—— The reversed halo sign is a focal rounded area of ground-glass opacity surrounded by a more or less complete ring of consolidation (Fig 63). A rare sign, it was initially reported to be specific for cryptogenic organizing pneumonia (117,118) but was subsequently described in patients with paracoccidioidomycosis (119). Similar to the halo sign, this sign will probably lose its specificity as it is recognized in other conditions. (See also halo sign.)
Figure 63: Transverse CT scan shows reversed halo sign (arrow).CT掃描顯示反暈徵
— 反暈圈徵是指局灶的環形磨玻璃影周圍環繞一圈輕重不一的完全實變影（圖63）.反暈圈徵罕見，它首次被報導時是特別用於描述隱源性機化性肺炎，但後來又見於南美芽生菌病患者。與暈圈徵相似，這種徵象在其他疾病也可發現，故可能沒有特異性。