With the advent of CT we entered a new area of radiological
imaging. Structures which rarely if ever were seen became apparent.
In no part of the body was the impact of CT as profound as it was
in the retroperitoneum. In the pre-CT area this region of the body
could not be directly studied and only when gross abnormalities
were present could they be appreciated. The best we could do was to
try to identify a suspected process by studying its effect on
surrounding organs whose position might have been affected by the
growth. Urography, barium studies or angiography were employed in
the hope that variation in the position of the vessels, ureter or
bowel would lead us to the correct diagnosis. With computed
tomography all this changed. Modern scanners, available to all
today, permit us to appreciate details undreamed of only few years
ago. The abundance of fat in this region helps to clearly show even
the smallest of structures. We now have the ability to recognize
small vessels, lymph nodes and fascial planes. We had a tool which
permitted us to study structures which hitherto were only seen by
the anatomist or during surgical dissection.
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