# Polymyositis and Dermatomyositis

**IRI:** https://folio.openlegalstandard.org/RDdyPvY5xsn96YiRSMnjTXV

## Labels

**Preferred Label:** Autoimmune Muscle Inflammation

**Alternative Labels:**

- Idiopathic Inflammatory Myopathy
- Inflammatory Myopathy
- Myositis

## Definition

Polymyositis and dermatomyositis are related disorders that are characterized by an inflammatory process in striated muscle, occurring alone or in association with other autoimmune disorders or malignancy. The most common manifestations are symmetric weakness, and less frequently, pain and tenderness of the proximal limb-girdle (shoulder or pelvic) musculature. There may also be involvement of the cervical, cricopharyngeal, esophageal, intercostal, and diaphragmatic muscles.

## Sub Class Of

- https://folio.openlegalstandard.org/RBJ0dgV4Z2Xk7aGfJt2nSj7

**Deprecated:** False