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Idiopathic granulomatous angiitis of the CNS manifesting as diffuse white matter disease
P F Finelli1, H C Onyiuke, D F Uphoff
1Department of Neurology, Hartford Hospital, University of Connecticut School of Medicine, USA.
Abstract:
A 48-year-old man presented with progressive spastic paraparesis and diffuse white matter involvement on neuroimaging that suggested a primary demyelinating disease. Brain biopsy 3 years after onset of symptoms demonstrated idiopathic granulomatous angiitis. In patients with MRI features of diffuse white matter disease of uncertain etiology, open brain biopsy of leptomeninges and parenchyma should be considered to exclude idiopathic granulomatous angiitis of the CNS.
Insights
Idiopathic granulomatous angiitis can mimic demyelinating disease. Early brain biopsy is crucial for diagnosing this rare condition in patients with unexplained white matter abnormalities.
Area of Science:
- Neurology
- Neuroimmunology
- Neuroinflammation
Background:
- Idiopathic granulomatous angiitis (IGA) is a rare, potentially devastating neurological condition.
- IGA can present with non-specific symptoms, mimicking other neurological disorders like multiple sclerosis.
Observation:
- A 48-year-old male exhibited progressive spastic paraparesis and diffuse white matter lesions on neuroimaging.
- Initial presentation suggested a primary demyelinating disease, leading to a diagnostic delay of 3 years.
Findings:
- Brain biopsy ultimately revealed idiopathic granulomatous angiitis as the underlying cause.
- This highlights the diagnostic challenge of IGA, especially in its early stages.
Implications:
- Neuroimaging findings of diffuse white matter disease with uncertain etiology warrant consideration of central nervous system (CNS) idiopathic granulomatous angiitis.
- Open brain biopsy of leptomeninges and parenchyma should be considered in such cases to establish a definitive diagnosis and guide treatment.
- Early diagnosis of IGA is critical for timely intervention and potentially preventing irreversible neurological damage.