PMC9168305_01
Preoperative MRI demonstrating a sharply margined extra-axial temporal mass with relatively homogeneous contrast-enhancement and extends to the sella turcica and the sub-temporal fossa (a) T1-weighted image (arrow), (b-d) T1-weighted image with gadolinium contrast on transverse, coronal, and sagittal section, and (e) T2-weighted image (arrow).
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F1
The lesion was strongly enhanced after the injection of gadolinium [Figure 1].
Dense lymphoplasmocytic infiltrate (a: Hematoxylin and Eosin x100; b: Hematoxylin and Eosin x400).
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F2
Histological examination showed dense lymphoidplasmacytic infiltrate with storiform fibrosis [Figures 2 and 3].
Storiform fibrosis (Hematoxylin and Eosin x100).
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F3
Histological examination showed dense lymphoidplasmacytic infiltrate with storiform fibrosis [Figures 2 and 3].
Immunostaining of many plasma cells with the IgG4 antibody (x100).
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F4
Immunohistochemical staining revealed an increased number of IgG4-positive plasma cells [Figure 4].
Postoperative MRI (a) T1-weighted image in sagittal section and (b and c) T2-weighted image in axial and coronal section.
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F5
A cerebral MRI was done 1 month after a well-conducted treatment and showed a reduction of the tumor's size [Figure 5].