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Figure 1: Computed tomography scan of thorax showing a well-defined fluid-attenuated cystic lesion in posterior mediastinum (a), microphotograph showing esophageal duplication cyst lined by nonkeratinizing stratified squamous epithelium and double-walled smooth muscle wall (b), bronchogenic cyst lined by ciliated columnar epithelium and having cartilage and seromucinous glands in its wall (c), common wall between two cysts showing cartilage and gastric glands (d), (H and E, ×40)

Figure 1: Computed tomography scan of thorax showing a well-defined fluid-attenuated cystic lesion in posterior mediastinum (a), microphotograph showing esophageal duplication cyst lined by nonkeratinizing stratified squamous epithelium and double-walled smooth muscle wall (b), bronchogenic cyst lined by ciliated columnar epithelium and having cartilage and seromucinous glands in its wall (c), common wall between two cysts showing cartilage and gastric glands (d), (H and E, ×40)