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©The Author(s) 2016.
World J Radiol. Jun 28, 2016; 8(6): 581-587
Published online Jun 28, 2016. doi: 10.4329/wjr.v8.i6.581
Figure 2
Figure 2 Air crescent sign: Chest X-ray showing well defined round radio-opacity in right lower zone with presence of a radiolucent rim at its superior aspect (arrow). This sign is however not specific for hydatid cyst and can be seen in mycetoma, bronchogenic carcinoma, blood clot and pulmonary artery aneurysm.


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