Two patients developed progressive muscle weakness in adult life. The initial diagnosis of polymyositis was made in both cases, but subsequent studies and the distribution of muscle involvement suggested facioscapulohumeral myopathy. Other investigators have proposed that this syndrome may result from either genetic or acquired causes. In our patients, the disorder was probably a sequela of polymyositis.
Kaner, J.; Zuniga, J.; and Teasdall, Robert D.
"The Facioscapulohumeral Syndrome: A Report of Two Cases,"
Henry Ford Hospital Medical Journal
: Vol. 30
Available at: https://scholarlycommons.henryford.com/hfhmedjournal/vol30/iss1/8