Abstract
Two adrenal gland tumours in captive born cotton-top tamarins (Saguinus oedipus oedipus) are described. One was a pheochromocytoma in a 14-year-old male, the other one a cortical adenoma in a 7.5-year-old female. Both were associated with morphological signs of myocardial damage and circulatory problems. The findings are discussed and compared to adrenal gland tumours in man.