Both. Some of these tumors occur as a result of an inherited syndrome, whereas others are thought to be spontaneous. Syndromes associated with these tumors include von hippel lindau, men, and the hereditary pheochromocytoma-paraganglioma syndromes.
Pheochromocytoma. 26 F from Palo Alto asks if pheo is inherited or spontaneous. I specialize in this and happy to do 2nd opinion to help you and team get the best of care. Some are inherited but most are not. It is a deadly disease so be certain you are seeing an expert. I can recommend Stanford.