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Fig. 6 —53-year-old man with stent placed for palliation of dysphagia caused by malignant tumor of uncertain origin encasing mid esophagus. Right posterior oblique spot image from single-contrast esophagram shows focal segment of marked luminal narrowing (black arrows) in distal end of stent. Note irregular contour and abrupt, shelflike distal margins (white arrows) of narrowed segment. At endoscopy, this finding was caused by tumor ingrowth through uncovered distal end of stent.