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Multiple Endocrine Neoplasia (MEN) Subtype Classification

Pathology/Endocrine
MEN I is disease of 3 P's
Pituitary tumors 
Parathyroid hyperplasia 
Pancreatic islet cell tumors

MEN IIa is disease of 2 P's and 1 M
Parathyroid hyperplasia 
Pheochromocytoma
Medullary Thyroid Cancer

MEN IIb is disease of 2 M's and 1 P
Marfanoid habitus / Mucosal neuroma 
Medullary thyroid cancer
P
heochromocytoma

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