Lymphoplasmacyte-rich meningioma - lumbar
Lumbar pain from three months ago.
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Marked canal stenosis and derangement of the nerve roots are seen at the L4 level in the background of a 15*40 mm iso-signal extradural infiltrative mass lesion with invasion to the posterior elements of L4 vertebrae (including pedicle, lamina, spinous process and the posterior third portion of the vertebral body).
Sections show a neoplastic tissue heavily infiltrated by lymphoplasmocyte. The neoplasm tissue composed of cells with round to oval nuclei, eosinophilic cytoplasm, and indistinct cytoplasmic rim.
Diagnosis: Lymphoplasmocyte-rich meningioma.