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Lipomatous meningioma.

Shigeo Ohba¹, Kazunari Yoshida, Takekazu Akiyama

¹Department of Neurosurgery, Keio University School of Medicine, 35 Shinano-machi, Shinjuku-ku, Tokyo 160-8582, Japan. di045009@sc.itc.keio.ac.jp

Journal of Clinical Neuroscience : Official Journal of the Neurosurgical Society of Australasia

|January 24, 2007

Summary

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This study reports a rare intracranial lipomatous meningioma case. Surgical removal was successful, with detailed histopathological and immunohistochemical analysis of this unique brain tumor.

Area of Science:

Neuro-oncology
Neurosurgery
Pathology

Background:

Meningiomas are common primary intracranial tumors.
Lipomatous meningiomas are a rare subtype, characterized by adipose tissue infiltration.
Understanding their distinct features is crucial for diagnosis and management.

Observation:

A 64-year-old woman presented with an intracranial lipomatous meningioma in the parietal convexity.
Imaging revealed characteristic features: low density on CT, T1 hyperintensity, and fat-suppressed signal loss on MRI.
Gross total tumor removal was achieved.

Findings:

Histopathology confirmed a mixed meningioma with transitional and lipomatous components.
Immunohistochemistry showed differential expression of EMA, vimentin, and S-100 protein between meningothelial and lipomatous areas.

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Low Ki-67 indices (1.0% and 1.8%) indicated low proliferative activity in both components.

Implications:

This case highlights the importance of recognizing the imaging and pathological characteristics of lipomatous meningiomas.
Accurate diagnosis impacts surgical planning and prognosis.
Further research into this rare meningioma subtype may refine treatment strategies.