This study is utilizing ultrasound measurement to measure neuromuscular disease status in adult patients. The hypothesis is the by quantifying ultrasound data, it is possible that ultrasound can be utilized as a tool to determine if a disease is responding to therapy or progressing.

Inclusion Criteria:

• History of a well-defined, localized or generalized neuromuscular condition producing weakness or muscle atrophy, including disuse atrophy.

Exclusion Criteria:

• Multiple generalized neuromuscular conditions.

Patients with any neuromuscular disorder (i.e. primary nerve or muscle disease), both localized and generalized, producing some degree of weakness or disability.