A chromogranin level of 1800 is quite high and taking account your blood pressure and a tumor near the adrenal gland for me would be quite alarming. I had high blood pressure and a large 10 cm tumor near the adrenal gland and was referred to a city of hope surgical oncologist. I needed preoperative alpha and beta blockers to control blood pressure as they said I could have a stroke during surgery. The surgery was successful, unfortunately the left kidney and adrenal gland had to be removed. Post-op diagnosis was extra adrenal Pheochromocytoma or Paraganglioma. The two terms are interchangeable more or less. I would ask your doctor to have additional testing such as 24 hour urine and plasma catecholamines as well as 24 hour urine and plasma metanephrine.