A case of renovascular hypertension due to polyarteritis nodosa.

In renal vasculitis, luminal narrowing can reduce blood flow and activate the renin-angiotensin-aldosterone system, causing renovascular hypertension. We present the case of a 47-year-old man with previous intestinal tuberculosis and episodes of lumbar pain, tender erythematous nodules and arthralgias. He had grade 3 hypertension, unresponsive to treatment, with left ventricular concentric hypertrophy and chronic kidney disease. He was admitted to the ICU due to a hypertensive emergency, with acute kidney failure and a large peri-renal hematoma. The computed tomography and angiography showed bilateral renal scarring, intrarenal pseudoaneurysms and irregularities in the renal, common hepatic and mesenteric arteries, suggesting a medium-vessel vasculitis, namely polyarteritis nodosa. Cyclophosphamide and corticosteroids were started. His blood pressure was controlled, and his kidney function remained stable. Renovascular hypertension is, in infrequent cases, caused by an inflammatory systemic disease. When this is the case, the diagnosis must be considered and appropriately addressed.