A rare cause of complicated hypertension: urinary bladder paraganglioma.

After a subarachnoid hemorrhage, a 35-year-old patient developed paroxystic hypertension accompanied by typical symptoms. These symptoms occurred exclusively after urination. A urinary bladder paraganglioma was discovered using iodine-123 metaiodobenzylguanidine (I-123 MIBG) scintigraphy and magnetic resonance imaging (MRI) after the detection of an abnormally elevated plasma metanephrine measurement.