Ominsky S, Berinson H S
Radiology. 1977 Feb;122(2):311-3. doi: 10.1148/122.2.311.
A well-demarcated U or V-shaped gas density superimposed over the trachea on posteroanterior chest radiographs is due to air in the suprasternal fossa. This is the depression on the skin surface of the neck between the sternal heads of the sternocleidomastoid muscles. The fossa is frequently visualized radiographically in cachectic or very thin people, and in patients with prior laryngectomies. It is also seen in patients with chronic obstructive lung disease and in patients in acute respiratory distress. Because of its typical location and configuration, it should not be confused with an air-fluid level in the esophagus or an upper airway diverticulum.
在后前位胸片上，气管上叠加的界限清晰的U形或V形气体密度影是由于胸骨上窝内的空气所致。胸骨上窝是胸锁乳突肌胸骨头之间颈部皮肤表面的凹陷。在消瘦或非常瘦的人以及既往接受过喉切除术的患者中，该凹陷在X线片上常可显示。在慢性阻塞性肺疾病患者和急性呼吸窘迫患者中也可见到。由于其典型的位置和形态，不应将其与食管内的气液平面或上气道憩室相混淆。
