PMC7813981_01
PET-CT scan of the whole body demonstrated the fluorodeoxyglucose (FDG)-avid mass (maximum standard uptake volume (SUVmax 2.6).
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A high-resolution positron emission tomography (PET)-computed tomography (CT) scan of the whole body demonstrated the fluorodeoxyglucose (FDG)-avid mass described above (maximum standard uptake volume (SUVmax 2.6), while no involvement of the bony canal walls was identified ( Figure 1 ).
(A) Tumor mainly composed of pale and dark cells, which are similar to basaloid in benign part (HE, x 100). (B) Lymphocytes (arrows) were infiltrated around the central tumor area (HE, x 100). (C) Partial capsule is incomplete (arrows), forming a focal infiltration (HE, x 100). (D) The mitotic activity (arrow) was high with a mitotic index count estimated at 10~15 mitosis per 10 high power field (HE, x 400).
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The benign area of tumor tissue showed typical ES histological characteristics, consisting of two types of cells: small cells with darkly staining nuclei surrounding larger cells with pale cytoplasm ( Figure 2A ). Lymphocytes had infiltrated around the central tumor area ( Figure 2B ), and the capsule was incomplete, forming a focal invasion ( Figure 2C ) at the transition zone between the benign and malignant components under review. High mitotic activity was observed, with a mitotic index count estimated at 10-15 mitotic cells per 10 high-power fields ( Figure 2D ), and some of these cells were atypical.