The presence of collateral arterial supply was examined by angiography in 19 children with Wilms' tumour. Collateral arterial supply was related to tumour size. Ten of 14 tumours displaying collateral circulation were entirely intrarenal at operation, confirmed by histopathology. Angiography in Wilms' tumour is indicated when the results of urography, ultrasonography or computed tomography are equivocal or extrarenal tumour growth is suggested.
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