الفهرس 
Anatomy of Adrenal GlandOnly 14 pages are availabe for public view
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Abstract
Pheochromocytoma is a catecholamine secreting tumour that arises
from the chromaffin cells of the sympathetic nervous system in the
adrenal medulla and the sympathetic chain; however, it may arise
anywhere in the body. Patients present with a variety of symptoms which
reflect excessive secretion of catecholamines (norepinephrine,
epinephrine, or dopamine) into the circulation. The released
catecholamines cause significant hypertension, often severe and
refractory to conventional treatment. The greatest frequency occurs in the
fourth and fifth decade of life, with a slightly higher female
preponderance. About 90% of pheochromocytomas occur sporadically
and are benign. Around 10% of cases occur in children or adolescents.