This site is intended for healthcare professionals

Go to /sign-in page

You can view 5 more pages before signing in


Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

Dermatomyositis and polymyositis are ischaemic myopathies resulting from capillary obliteration and consequent muscle infarction.

Muscle biopsy shows an inflammatory cell infiltrate:

  • in dermatomyositis these cells are predominantly B lymphocytes with some T-helper lymphocytes - suggesting a humoral autoimmune mechanism

  • in polymyositis the cells are mainly cytotoxic T cells - suggesting a cell-mediated autoimmune mechanism

Create an account to add page annotations

Add information to this page that would be handy to have on hand during a consultation, such as a web address or phone number. This information will always be displayed when you visit this page