Peroral contrast agent supported chest X-ray showing a long filiform distal esophageal stenosis (2-3 cm) exhibiting all signs of an achalasia.
Figure 1: X-ray showing stenosis

Low power photomicrograph showing the normal architecture oral to the stenotic segment. (Transverse section: Haematoxylin and eosin)
Figure 2: Non-stenotic esophageal segment/p>

Low power photomicrograph showing the architecture of the stenotic segment, note the disrupted muscle layers, cartilage and sero-mucinous glands. (Transverse section: Haematoxylin and eosin)
Insert X: High power view of the esophageal epithelial lining showing pseudostratified columnar focally ciliated epithelium and normal stratified squamous epithelium. Insert #: View on dilated ducts lined by pseudostratified ciliated columnar epithelium surrounded by lymphatic tissue. Insert *: Closer view on cartilage and the abundant bronchial sero-mucinous glands.
Figure 3: Stenotic esophageal segment due to tracheobronchial remnants/p>

1.Tracheoesophageal fistula, the most common anomaly in this group
2.Esophageal cysts lined by respiratory epithelium [10,11]
3.Lung bud of esophageal [12] and ectopic origin of the right main bronchus from the esophagus [13]
4.Esophageal stenosis due to partial webs, fibromuscular thickening or total atresia [14,15]
5.Esophageal stenosis due to tracheobronchial remnants with or without cartilage [16,17]

Table 1: Results of the failures of the separation process of the esophagus and trachea