RESUMO
BACKGROUND: Interferon-beta (INF-beta) is effective and used in reducing exacerbation frequency and disease progression in multiple sclerosis. In certain circumstances, INF-beta can lead to rare side effects. AIMS OF THE STUDY: We report the case of a 34-year-old female patient satisfying the McDonald criteria of multiple sclerosis without showing typical pathologic changes in cerebrospinal fluid (CSF). After introduction of INF-beta treatment, she quickly developed further progression of her disseminated neurological symptoms and finally an ischemic cerebral infarction. METHODS: Evaluation of the patient included arterial angiography, magnetic resonance and positron emission tomography, histopathological assessment as well as a broad spectrum of serum and CSF analysis. RESULTS: All diagnostic evaluations and the clinical course revealed evidences for a primary angiitis of the CNS. We discuss the possible worsening due to inappropriate INF-beta treatment in cerebral angiitis promoting severe cerebrovascular insufficiency. CONCLUSION: The authors suggest that all diagnostic multiple sclerosis criteria including typical CSF findings should be ascertained before INF-beta treatment is initiated.
