Medicine General a9544407 10% Tumour is A Pheochromocytoma B Papillary Thyroid Carcinoma C Follicular Thyroid Carcinoma D Brown’s Tumor High-Yield Explanation Pheochromocytomas normally obey the “rule of 10”. Hence, they are also called the “10% tumor”. i.e. 10% of pheochromocytomas are: Familial. Malignant. Bilateral. Extra-adrenal. Seen in children