Inclusion Body Myositis - Classification

Classification

• The common type is sIBM (sporadic Inclusion Body Myositis): it strikes individuals apparently at random.
• There is a type that has been observed in multiple siblings in the same generation in several families: termed familial inflammatory sIBM, but it is not passed on from generation to generation.
• There are also several very rare forms of hereditary inclusion body myopathy (hIBM) that are linked to specific genetic defects and that are passed on from generation to generation, each inherited in different ways. See hereditary inclusion body myopathy.