Abstract
An analysis of 102 PDGs is given with regard to the anatomy of the peridural spaces and of 98 PDGs verified at operation as to their diagnostic value. The anatomical picture and its variations (including anomalies and some pathological findings) are explained by the geometrical shape of the lumbosacral spinal canal which is oval in the upper, triangular in the lower lumbar and slit-like in the sacral region. From the anatomical analysis, as well as from our clinical material, it can be deduced that PDG has about the same diagnostic value as PMG, offering the advantage of the extradural application of contrast material, i.e. harmlessness and applicability in out-patients.
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