“…There are cases of patients with the clinic of a pheochromocytoma in which pathological examination clearly showed the histology of an adrenal adenoma (Ramsay et al, 1987;Unger et al, 1990), as well as cases of the exact opposite (Kowacs and Horvath, 1973;Le Compte, 1944;Mathison and Waterhouse, 1969). We also find descriptions of mixed tumours (Gordon et al, 1994;Robinson and Baker-Bates, 1954;Williams et al, 1960) and of cells with the characteristics of adrenal-medulla and adrenal-cortex cells .…”