You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Which among the following is the most common site of ectopic phaeochromocytoma? and explain in detail?
Almost all pheochromocytomas (about 90%) occur in the abdomen, and most of these (85%) are in the adrenal medulla. Extra-adrenal pheochromocytomas (including sympathetic and parasympathetic paragangliomas) are found in the perirenal area, the organ of Zuckerkandl, the urinary bladder, the hea, the neck, and the posterior mediastinum. Extra-adrenal pheochromocytomas account for 10% of all pheochromocytomas in adults and 30-40% of pheochromocytomas in children. They are usually larger than adrenal pheochromocytomas. Ref: Else T., Hammer G.D., McPhee S.J. (2010). Chapter 12. Disorders of the Adrenal Medulla. In S.J. McPhee, G.D. Hammer (Eds), Pathophysiology of Disease, 6e.