摘要:This case report presents a patient with pheocromocytoma and the first use of 123I-MIBG scintigraphy in the diagnostic workup of an adrenal gland tumor with elevated metanephrine and normetanephrine levels in Croatia. The patient had intensive pulsing headaches for a year. A tumour of the right suprarenal gland has been observed by ultrasound, by CT scan, and by MRI of the abdomen. A comprehensive endocrinological observation revealed significantly increased values of metanephrine, normetanephrine, epinephrine and noreinephrine. 123I-MIBG scintigraphy excluded multiple tumours and metastases of malignant pheochromocytoma. After surgery, diagnosis of pheochromocytoma was proven histologically. Three weeks after surgery, the values of metanephrine and normetanephrine were within the normal range.