The onset of polymyositis (PM) is usually in adulthood, typically ages 20-60, although it can affect someone of any age. It is twice as common in women than men.

According to Lloyd, the selection of which muscle to biopsy is critical. If the biopsied muscle is too weak, the results may suggest just end stage fibrosis. “We always select muscles that are ...

The clinical features of polymyositis with elevated muscle enzymes, along with evidence of inflammation on MRI, all occurred in the setting of biopsy proven chronic GVHD.

The onset of polymyositis (PM) is usually in adulthood, typically ages 20-60, although it can affect someone of any age. It is twice as common in women than men.