Diagnosis of abdominal lesions. The use of intravenous aortography, nephrotomography and retrograde aortography.

New and safe methods of investigating the kidney by x-ray visualization of its circulation are now available. This can be done either by injecting large amounts of contrast material through a vein and then taking multiple x-ray exposures of the kidneys, or by injecting the contrast material backward into the aorta to the level of the renal arteries. Another method of x-ray examination now available is taking body section films of the kidneys when the contrast medium is in the kidney substance. This makes the kidney outline extremely sharp and allows more precise diagnosis.