Putman C E, Curtis A M, Westfried M, McLoud T C
Radiology. 1976 Dec;121(3 Pt. 1):533-6. doi: 10.1148/121.3.533.
A thickened posterior tracheal stripe (wider than 4.5 mm) was identified on the lateral check radiographs of 20 patients with squamous cell carcinoma of the esophagus. Autopsy studies confirmed that peri-esophageal lymphatic involvement was responsible for the thickening of the stripe in the nonobstructed esophagus. This sign appeared on the lateral chest radiograph as early as 6 months prior to the development of symptoms in 50% of the cases studied.
在20例食管鳞状细胞癌患者的胸部侧位X线片上发现气管后条纹增厚（宽度超过4.5毫米）。尸检研究证实，食管周围淋巴结受累是导致无梗阻食管中条纹增厚的原因。在50%的研究病例中，该征象早在出现症状前6个月就出现在胸部侧位X线片上。
