RET and hyperparathyroidism: MEN2 syndrome includes the following clinical entities: MEN2A (MTC related to pheochromocytoma and/or hyperparathyroidism), MEN2B (MTC associated with marfanoid features and occasionally pheochromocytoma) and FMTC (familial medullary thyroid carcinoma only), which may be considered a variant of MEN2A [3].