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Rupture of adrenal pheochromocytoma is extremely rare and can be lethal because of dramatic changes in the circulation. We describe a 58-year-old Japanese man who suffered rupture of a pheochromocytoma. The patient was referred to our hospital because of severe hypertension (256/127 mmHg) and a left adrenal tumor. T2-weighted magnetic resonance imaging showed high signal intensity in the 50-mm left adrenal tumor. Endocrinological examinations showed elevated plasma and urinary catecholamine levels. These findings suggested that the left adrenal tumor was a pheochromocytoma. Phentolamine mesilate was administered intravenously. This resulted in a decrease of the systolic blood pressure to 100 mmHg. On the third hospital day, the patient complained of left back pain, and abdominal computed tomography showed rupture of the pheochromocytoma. Pulmonary congestion and effusion, and paralytic small-intestinal ileus occurred. Blood pressure was controlled, small-intestinal decompression was done with a Miller-Abbot tube, and body water was controlled by fluid replacement. After the general condition of the patient had became stable, laparoscopic adrenalectomy was performed. Phentolamine mesilate is a useful α-adrenergic blocker. However, care is needed with its administration, because rupture of pheochromocytoma may be related to a decrease in blood pressure induced by phentolamine mesilate.
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