How common is it for somebody to get pheochromocytoma?

Pheochromocytoma. It is a very rare cause of HTN. I specialize in difficult HTN a common problem in pheo. I have only seen 12 cases in 55 years. Happy to do 2nd opinion to provide more help.
Uncommon. This is an uncommon cancer - in fact there are only 1000 new cases every year in the US. The symptoms are very typical and surgery is very helpful in most cases.