PMC9148993_01
MRI scans showed a well-defined irregular mass in the pons (B). The mass showed slight hyperintensity on T2-weighted MR images and FLAIR images (B, D) and comparatively lower intensity on T1-weighted MR images (A). Contrast-enhanced MR image showed prominent heterogeneous enhancement of the lesion, presenting central enhancement (C).
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The signal strength was low in T1-weighted images, while T2-weighted images were higher and more heterogeneous ( Figures 1A, B ). The mass showed a slightly high signal on FlAIR images ( Figure 1D ) and remarkably heterogeneous enhancement on post-contrast enhancement images ( Figure 1C ).
No significant abnormalities in the intracranial arteries on VRT (A) and MIP (B).
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Computed tomography angiography (CTA) of the brain detected no marked abnormalities in the intracranial arteries ( Figures 2A, B ).
Intraoperative MPC appears as a pink soft-tissue mass (A). Histological and immunohistochemical features of MPC. Hematoxylin-eosin staining showed that the tumor was composed of abundant spindle cells, which grew in concentric circles around small blood vessels (B). Immunohistochemical staining presented CD34 (+) (C), SMA (+) (D). [Original magnifications: (B-D) 200x].
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Intraoperatively, the tumor was a visualized as a pink mass with a well-demarcated margin and abundant blood supply ( Figure 3A ). Histopathological analysis showed considerable number of vasculature-rich spindle cells that developed in concentric circles around tiny capillaries with no evident nuclear division or mitosis, according to histopathological studies ( Figure 3B ). Vimentin (+), CD34 (vasculature+), SMA (+), S100 (-), GFAP (-), D2-40 (-), EBV (-), CK (-), 49EMA (-), Ki67 (1%+) were found in immunohistochemistry ( Figures 3C, D ).
Postoperative brain MRI indicated abnormal long T1-weighted and long T2-weighted signal (A, B) in the right part of the pons, which showed high signal on FLAIR imaging (D) and no enhancement of the lesion on contrast-enhanced imaging (C).
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Postoperative brain MRI showed abnormally long T1-weighted and long T2-weighted signals ( Figures 4A, B ) in the right part of the pons; furthermore, we detected a high signal on FLAIR imaging ( Figure 4D ) and no enhancement of the lesion on contrast-enhanced imaging ( Figure 4C ).