What is the term for the inflammation of muscle tissue?

The term that specifically refers to the inflammation of muscle tissue is "myositis." This condition involves inflammation that can affect muscle fibers and is characterized by symptoms such as muscle weakness, pain, and swelling. Myositis can have various causes, including autoimmune diseases, infections, and certain medications, leading to the deterioration of muscle tissue and function.

Polymyositis, while related to inflammation of muscle tissue, specifically refers to a chronic inflammatory condition that affects multiple muscles, distinguishing it from the more general term. In contrast, osteitis refers to inflammation of bone tissue, and osteosarcoma is a type of bone cancer. Therefore, myositis accurately defines the inflammation of muscle tissue.