1 Department of Radiology, Indiana University-Purdue University at Indianapolis, 1100 West Michigan Street, Indianapolis, Indiana 46202
A case is reported of an 8-year-old male who presented with mediastinal widening secondary to idiopathic dilatation of the superior vena cava. Roentgen signs of superior vena cava dilatation include a right, anterior, and superior location in the mediastinum, lack of tracheal deviation, and increased size on supine roentgenograms. Contrast studies to define the venous nature of such a mass can obviate thoracotomy.
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