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Fig. 1A. —45-year-old woman on day 7 after subtotal gastrectomy. Axial CT scans were obtained at level of kidneys before (A) and 1 hr 30 min after (B) oral administration of Gastrografin (methylglucamine diatrizoate; Schering, Berlin, Germany). Opacification of both renal collecting systems is seen in B.