<prompt> All of the following are features of MEN IIb, except -Pituitary tumorPheochromocytomaMedullary carcinoma thyroidNeuromas  <response>: MEN 2A is characterised by Medullary Thyroid Carcinoma 90, Pheochromocytoma 50 and Parathyroid adenoma 10-25.MEN 2B also known as MEN 3 is characterised by MTC 90, Pheochromocytoma 50 and associated abnormalities 40-50 - mucosal neuromas, marfanoid habitus, medullated corneal nerve fibres, megacolon. Reference : page 2336 Harrisons Principles of Internal Medicine 19th edition 