Severe Evans syndrome with multi-system involvement is a distinct immunodeficiency disorder

Area of Science:

• Pediatric immunology
• Autoimmune disorders
• Clinical case studies

Background:

• Evans syndrome is a rare autoimmune disorder characterized by co-occurring autoimmune hemolytic anemia and immune thrombocytopenia.
• Early diagnosis and aggressive management are crucial for improving outcomes in severe cases.

Observation:

• A female infant presented with severe autoimmune hemolytic anemia and thrombocytopenia.
• The infant subsequently developed multi-systemic involvement affecting the liver, skin, kidneys, lungs, gastrointestinal tract, endocrine system, and nervous system.

Findings:

• Intensive treatment with prednisone, intravenous immunoglobulin (IVIG), mycophenolate mofetil, and monoclonal antibodies (anti-CD20 and anti-CD52) was necessary for symptom control.
• Laboratory investigations revealed normal lymphocyte subsets and function, normal Foxp3 and CD25 expression, absence of an expanded CD4(-)CD8(-) T-cell population, and no mutations in the AIRE and Fas genes.

Implications:

• The patient's presentation represents the most severe end of the Evans syndrome spectrum.
• These unique clinical and laboratory features suggest a possible novel immunodeficiency disorder, warranting further investigation.