pheochromocytomas are cathecolamine producing tumor arising from chromaffin cells of adrenal medulla and extra adrenal tissues. this is a report of a boy presented with headache and hypertension. in radiologic exams, an adrenal mass detected in the left side, with no renal tissue on that side. it was reported an adrenal pheochromocytoma in histopathology. renal agenesis confirmed during surgery...