A case of Lymphoplasmacyte-rich meningioma mimicking pachymeningitis

Background Lymphoplasmacyte-rich meningioma (LPRM) is a rare form of meningioma characterized by prominent lymphoplasmacytic infiltrates into the tumor. Report of flat growth of LPRM mimicking pachymeningitis is rare in the literature. Case presentation A 55-year-old female who suffered from episodes of headache and seizures has been diagnosed with pachymeningitis for 4 years because post contrast brain MRI demonstrated enhanced carpet-like dura lesion in the left frontal lobe. The lesion kept unchanged on yearly follow-ups until a recent brain MRI found the lesion grew significantly into a mass. The lesion was resected and pathology suggested LPRM. Conclusion LPRM may present as carpet-like growth pattern on MRI. Long-term follow-up in patients with pachymeningitis is necessary.