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Differential diagnosis of posterior fossa multiple sclerosis lesions--neuroradiological aspects
A Falini1, C Kesavadas, S Pontesilli
1Department of Neuroradiology, Scientific Institute San Raffaele Hospital, Milan, Italy.
Abstract:
Various infratentorial pathological conditions can mimic multiple sclerosis (MS) both clinically and radiologically. We review the inflammatory, vascular, neoplastic and metabolic conditions which show features similar to those of MS on magnetic resonance imaging (MRI). Behcet's disease, Lyme disease, progressive multifocal leukoencephalopathy, neurosarcoidosis, Whipple's disease, listeria rhombencephalitis, Bickerstaff's brainstem encephalitis, vasculitis due to systemic lupus erythematosus, and acute disseminated encephalomyelitis produce inflammatory lesions similar to those of MS in the brainstem and cerebellum. Neoplastic diseases, in particular pontine gliomas and lymphomas, can mimic MS. Vascular ischaemic lesions, either due to infarction produced by occlusion of a major posterior circulation artery or due to small vessel vasculopathy, can lead to posterior fossa lesions. The MRI changes of central pontine myelinolysis can also mimic MS. Diffuse axonal injury, radiation and chemotherapy induce lesions that resemble MS, however the clinical history will exclude these possibilities. Finally, we discuss a few conditions which are similar to MS in clinical presentation but have different MRI appearances, such as brainstem cavernomas, posterior fossa tumoural lesions, aneurysms and vascular loops producing neurovascular conflicts. Analysis of the MRI findings with clinical history and laboratory data helps to narrow down the diagnosis of the infratentorial pathology.
Insights
Many conditions can mimic multiple sclerosis (MS) on MRI scans, especially in the brainstem and cerebellum. Differentiating these infratentorial pathologies requires careful analysis of MRI findings alongside clinical and laboratory data.
Area of Science:
- Neurology
- Radiology
- Pathology
Background:
- Infratentorial pathologies can present with clinical and radiological features similar to multiple sclerosis (MS).
- Accurate differentiation is crucial for appropriate patient management and treatment.
Purpose of the Study:
- To review various infratentorial conditions that mimic MS on magnetic resonance imaging (MRI).
- To highlight the importance of integrating MRI findings with clinical and laboratory data for diagnosis.
Main Methods:
- Review of inflammatory, vascular, neoplastic, and metabolic conditions affecting the posterior fossa.
- Analysis of MRI characteristics of these conditions in comparison to MS.
- Discussion of conditions with similar clinical presentations but distinct MRI appearances.
Main Results:
- Inflammatory conditions (e.g., Behcet's disease, Lyme disease, neurosarcoidosis) can cause MS-like lesions in the brainstem and cerebellum.
- Neoplastic diseases (e.g., pontine gliomas, lymphomas) and vascular lesions (infarction, vasculopathy) can also mimic MS.
- Metabolic conditions like central pontine myelinolysis and iatrogenic causes (diffuse axonal injury, radiation) present diagnostic challenges.
Conclusions:
- A wide spectrum of infratentorial pathologies can be mistaken for MS based on imaging.
- Comprehensive evaluation integrating MRI, clinical history, and laboratory results is essential for accurate diagnosis and to exclude MS.