. Radiography and radio-therapeutics . (ESOPHAGEAL OBSTRUCTION 313 food, clearly show that the shadows which gave rise to difficulty in diagnosiswere due to this pathological condition. Cancer is probably the most frequent cause of obstruction of theoesophagus. It may appear at any part of the structure, but is mostcommonly met with at the middle third and near the cardiac orifice. In the former situation the characteristic appearances are an arrest ofthe opaque food at a point above the stricture, a degree of dilatation of theoesophagus above the point of narrowing, and in some cases a thin f
. Radiography and radio-therapeutics . (ESOPHAGEAL OBSTRUCTION 313 food, clearly show that the shadows which gave rise to difficulty in diagnosiswere due to this pathological condition. Cancer is probably the most frequent cause of obstruction of theoesophagus. It may appear at any part of the structure, but is mostcommonly met with at the middle third and near the cardiac orifice. In the former situation the characteristic appearances are an arrest ofthe opaque food at a point above the stricture, a degree of dilatation of theoesophagus above the point of narrowing, and in some cases a thin faintirregular streak of opaque material below the point of stricture. This may,especially in children, have quite a tortuous outline. The degree of dilatation. OESOPHAGUSLOWER SWELLING
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