Abstract
Background Inflammatory pseudotumor primarily affecting the CNS is an extremely rare lesion with uncertain etiology in most cases. Case Description A 67-year-old man developed involuntary movement disorder of the left upper extremity. On MRI, a solid homogeneously-enhanced tumor was noted in the right lateral ventricle adjacent to the thalamus. He had histories of right thalamic hypertensive hemorrhage and recurrent chronic nasal sinusitis associated with an orbital mass lesion, presumably an IP. Partial removal of the tumor yielded a diagnosis of IP associated with EBV infection. Conclusion The simultaneous occurrence of multiple IPs was presumably because of an exaggerated immune process after EBV infection. Inflammatory pseudotumor should be considered in any case of intraventricular mass lesion.
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