Abstract
Renal venous thrombosis (RVT) is a serious complication of neonates. In most cases the underlying cause of RVT remains unclear. Here we report a neonate with bilateral RVT and adrenal haemorrhage associated with a heterozygous mutation of the gene encoding for clotting factor V, resulting in resistance to activated protein C. Vigorous thrombolytic therapy with urokinase followed by recombinant tissue plasminogen activator dissolved the thrombus in the inferior vena cava and restored perfusion of both kidneys. However, a haemorrhagic rupture of the right kidney occurred, requiring emergency nephrectomy. Despite reperfusion of the left kidney and resumption of urine output, the patient remained dialysis dependent. Due to persistent adrenal insufficiency, long-term substitution of hydrocortisone was necessary. The patient was prophylactically treated with coumarin during the first 6 months of life and is now waiting for renal transplant at the age of 1 year.
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