Eosinophilic fasciitis: clinical, laboratory, and microscopic considerations

Area of Science:

• Rheumatology
• Immunology
• Pathology

Background:

• Investigating the complex relationship between eosinophilic fasciitis and scleroderma.
• Examining systemic and serologic abnormalities in eosinophilic fasciitis.

Observation:

• Two patients presented with eosinophilic fasciitis, arthritis, mononuclear muscle infiltration, IgA deficiency, and pulmonary dysfunction.
• One patient exhibited colonic diverticulae and amyloid deposits; the other had bone marrow hypoplasia.
• Fascial inflammation was minimal, with heaviest lesions deep in skeletal muscle.

Findings:

• Eosinophilic fasciitis can manifest with scleroderma-like features, including systemic and serologic abnormalities.
• Muscle inflammation, characterized by mononuclear cell infiltration, is prominent, while fascial involvement is less severe.
• Therapeutic benefits were observed with corticosteroids, hydroxychloroquine, and potassium para-aminobenzoate.

Implications:

• Findings challenge the primary role of fascial inflammation in eosinophilic fasciitis.
• Suggests that fascial lesions may result from adjacent skeletal muscle inflammation.
• Highlights the need for a broader understanding of eosinophilic fasciitis pathogenesis and its relation to connective tissue diseases.