A 1-day-old boy born at 37 weeks gestation presented with hematuria, thrombocytopenia, and palpable irregular right flank mass. Renal ultrasound demonstrated large clot within the bladder, bilateral kidney masses with loss of corticomedullary differentiation, and reversal of diastolic flow. The patient was diagnosed with bilateral renal vein thrombosis and was managed conservatively. There was complete resolution of the bladder clot with restoration of corticomedullary differentiation bilaterally. We report the first case of renal vein thrombosis associated with a large bladder clot in a neonate.
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