PMC2698072_01
A 43-year-old woman who underwent a routine medical checkup.. A, B. Transverse (A) and longitudinal (B) sonograms of the neck depict a 2.9 x 1.4 - cm hypoechoic mass (thick arrows) with multiple hyperechoic foci (thin arrow) at the inferoposterior aspect of the right lobe of the thyroid gland.. C. Neck CT shows an air-filled cyst (arrow) with an irregular wall to the right of the trachea.. D. Reformatted coronal CT image depicts slit-like communication (arrowhead) between the trachea and the air cyst.. (A=right common carotid artery, C=paratracheal air cyst, E=esophagus, T=trachea)
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F1
Neck ultrasonography revealed a 2.9x1.4-cm hypoechoic mass at the inferoposterior aspect of the right lobe of the thyroid (Figs. 1A, B). It had an irregular wall (Fig. 1C), and multiplanar reformatted imaging showed that a slit-like structure linked it with the trachea (Fig. 1D).
PMC2698072_02
A 65-year-old man who presented with anterior neck pain.. A, B. Transverse (A) and longitudinal (B) sonograms of the neck reveal a 2.5x1.1-cm hypoechoic mass (thick arrows) with multiple hyperechoic foci (thin arrows) at the inferoposterior aspect of the right lobe of the thyroid gland.. C. Neck CT shows an air cyst (arrow) to the right of the trachea, with slit-like communication between it and the trachea.. D. Reformatted coronal CT image reveals the presence of an air pocket to the right of the trachea.. (C=paratracheal air cyst, E=esophagus, T=trachea, Th=right lobe of the thyroid gland)
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F2
Sonography indicated that the thyroid gland was normal, but at the inferoposterior aspect of its right lobe, an ill-defined hypoechoic mass was discovered (Figs. 2A, B). CT demonstrated an ill-defined air pocket, which communicated with the trachea (Figs. 2C, D). Chest radiographs revealed mild emphysematous change but did not depict the air pocket in the right lower neck region.