Myositis in a sentence as a noun

With that clue the doctors then were able to infer myositis from further blood tests.

Check my comment below about myositis, it's most likely what you had!

No, from the description myositis is highly unlikely.

I would be interested to know if they ever intend to expand the trials out to other autoimmune muscle related diseases, for example myositis and its variants.

Myositis definitions

noun

inflammation of muscle tissue