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In page Systemic scleroderma:

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Scleroderma renal crisis (SRC) is a life-threatening complication of systemic sclerosis that may be the initial manifestation of the disease.  Renal vascular injury (due in part to collagen deposition) leads to renal ischemia, which results in activation of the renin-angiotensin-aldosterone system (RAAS).  This raises blood pressure and further damages the renal vasculature, causing a vicious cycle of worsening hypertension and renal dysfunction (e.g., elevated creatinine, edema).  Hypertensive emergency with end-organ dysfunction (e.g., encephalopathy, retinal hemorrhage) is common.  Thrombocytopenia and microangiopathic hemolytic anemia can be seen.  Urinalysis is usually normal but may show mild proteinuria, as in this patient; casts are unexpected.[citation needed]