Abstract
ABSTRACTVascular filling defects are a normal feature of the thoracic myelogram. The aim of this paper was to provide criteria for differentiating the vascular filling defects in spinal AVM's from the range of filling defects seen in non‐AVM patients.Out of 940 consecutive thoracic myelograms, in non‐AVM patients, 505 had vascular filling defects. These were compared with the myelographic features of nine spinal AVM's, with regard to vessel diameter, length, tortuosity and number. None of these criteria were diagnostic of AVM's as there was overlap bet ween the vascular filling defects of AVM's and the range of normal spinal cord vessels, especial ly posterior spinal veins.However, filling defects greater than 1.4 mm diameter, which are excessively tortuous, long and. multiple, should be regarded as highly suspinous of an AVM.A lateral film is important when vascular filling defects are seen, for if these filling defects are anterior to the cord, an AVM is more likely.
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