Among 13 patients with DAVFs which drained retrogradely, those with a variceal accessory route (Group 1, n = 8) had a higher incidence of haemorrhage. In patients without such an accessory route (Group 2, n = 5) abnormal signal intensity on MRI was indicative of venous congestion. Continuous-mode angiography and MRI study were useful in the precise identification of DAVFs with a venous drainage route.
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