Chronic encephalitis in X-linked agammaglobulinaemia

Area of Science:

• Immunology
• Neurology
• Pediatrics

Background:

• X-linked agammaglobulinaemia (XLA) is a primary immunodeficiency characterized by a severe lack of B cells and antibodies.
• Patients with XLA are highly susceptible to recurrent bacterial infections.

Observation:

• A boy with XLA developed encephalitis, excemata, and non-suppurative arthritis following recurrent infections.
• Despite gammaglobulin therapy, he experienced progressive neurological decline, including spastic tetraparesis, seizures, mental deterioration, and blindness.
• The patient died at age 8 with necropsy findings of diminished lymphoid tissue and brain pathology.

Findings:

• Brain examination revealed cystic destructions and active chronic polioencephalitis, particularly affecting the basal ganglia and brain stem.
• Symmetric Wernicke-like lesions were observed in the inferior corpora quadrigemina.
• The observed neuropathology in this XLA patient is not fully understood but may involve a viral infection.

Implications:

• This case underscores the potential for severe, progressive central nervous system involvement in XLA.
• The findings suggest that novel or opportunistic infections, possibly viral, should be considered in the differential diagnosis of neurological complications in XLA patients.
• Further research is needed to elucidate the specific etiology and pathogenesis of encephalitis in XLA.