M35.4

Clinical Causes: The exact cause of diffuse eosinophilic fasciitis is unknown. Potential autoimmune components where the body's immune system mistakenly attacks its fascia. Possible triggers include strenuous physical activities, infections, or certain medications, although a definitive link has not been established. Genetic predisposition may play a role in susceptibility, but research is ongoing.

Key Symptoms: Progressive skin tightening, especially over the arms, legs, and trunk. Swelling and a feeling of hardness in affected areas. Pain or discomfort in muscles and fascia regions. Loss of flexibility and restricted movement, often starting in the limbs. Eosinophilia, which is an elevated number of eosinophils in the blood, may be detected. Less commonly, systemic symptoms such as fever or fatigue may occur.

Diagnosis Path: Clinical examination revealing skin thickening, swelling, and limited mobility. Blood tests indicating elevated eosinophil counts and inflammatory markers (e.g., ESR, CRP). Imaging studies like MRI can help visualize fascial thickening and inflammation. Skin and fascia biopsies are critical for confirming diagnosis, showing eosinophilic infiltration and fascial fibrosis. Differential diagnosis involves ruling out other sclerosing skin diseases and connective tissue disorders.

Treatment Protocols: Corticosteroids like prednisone are commonly used to reduce inflammation and control symptoms. Immunosuppressive agents such as methotrexate or azathioprine may be prescribed for steroid-sparing effects. Physical therapy can assist in maintaining mobility and preventing contractures. Monitoring for and managing side effects of medications is important. While there is no cure, early and aggressive treatment can improve outcomes and minimize tissue fibrosis.