Spontaneous outcomes of percutaneous biopsy-related arteriovenous fistulas in renal allografts instead of embolization are reported by describing two cases of postbiopsy arteriovenous fistula followed by color Doppler sonography (CDS). One patient developed gross hematuria, but no intervention was required. Doppler application showed spontaneous resolution in both cases but later in the patient with hematuria. Both cases support close observation, including CDS, as another alternative to early embolization.
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