case_images: PMC9831112_01
case_images: Magnetic resonance images. Coronal section of T2-weighted image.. T2-weighted image shows a hyperintense signal. The images from A to D are ventral to dorsal.
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case_images: PMC9831112_01_cureus-0015-00000033601-i01.jpg
case_images: FIG1
case_images: Magnetic resonance imaging (MRI) showed a tumor between the right perineal skin and the right thigh medial deep muscle, femoral adductor muscle, with hyperintense signal on T2-weighted images (Figures 1-2).
case_images: Magnetic resonance images. Sagittal section of T2-weighted image.. T2-weighted image shows a hyperintense signal. The image in B is more on the central side than in A.
case_images: cureus-0015-00000033601-i02.jpg
case_images: PMC9831112_01_cureus-0015-00000033601-i02.jpg
case_images: FIG2
case_images: Magnetic resonance imaging (MRI) showed a tumor between the right perineal skin and the right thigh medial deep muscle, femoral adductor muscle, with hyperintense signal on T2-weighted images (Figures 1-2).
case_images: Magnetic resonance images. Various types of axial dissection.. The T1-weighted image showed a mild hypointense signal. Diffusion-weighted images (DWI) showed a hyperintense signal, and apparent diffusion coefficient (ADC) maps showed a hypointense signal.. A is an ADC image. B is a T1-weighted image. C is a diffusion-weighted image with a b-value of 1000s/mm2. D is a fat-suppressed T2-weighted image. E is a fat-suppressed T1-weighted image. F is a diffusion-weighted image with a b-value of 0s/mm2.
case_images: cureus-0015-00000033601-i03.jpg
case_images: PMC9831112_01_cureus-0015-00000033601-i03.jpg
case_images: FIG3
case_images: Diffusion-weighted imaging (DWI) showed a hyperintense signal in the perineum and part of the adductor magnus muscle, and apparent diffusion coefficient (ADC) maps showed areas of hypointense signals, findings that were suspicious for malignancy (Figure 3).
case_images: Pathology diagram.. Image B in the center showed PAS staining, other images (A, C, D, and E) showed spindle-shaped, polygonal, and round tumor cells with hematoxylin and eosin staining. These cells proliferated in a cordate or reticulate fashion within the matrix of the myxoma.. A, tumor cells present a multinodular structure.
  B, spindle-shaped tumor cells are present in a mucus-like matrix.
  C, small tumor cells are present in a reticular pattern.
  D, tumor cells are present in a cord-like structure.
  E, tumor cells are spindle-shaped, polygonal, or round.. All images were taken with an indirect lens at 10x and an objective lens at 40x. (OLYMPUS BX53)
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case_images: PMC9831112_01_cureus-0015-00000033601-i04.jpg
case_images: FIG4
case_images: Pathologically, as shown in Figures 4-5, hematoxylin and eosin staining revealed spindle, polygonal, and round tumor cells, which appeared mucinous on periodic acid Schiff staining.
case_images: Immunostaining. A shows positive for vimentin. B indicates that INI-1 does not become negative.
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case_images: PMC9831112_01_cureus-0015-00000033601-i05.jpg
case_images: FIG5
case_images: Pathologically, as shown in Figures 4-5, hematoxylin and eosin staining revealed spindle, polygonal, and round tumor cells, which appeared mucinous on periodic acid Schiff staining. Immunostaining results were positive for vimentin and integrase interactor 1 (Figure 5), and negative for cytokeratin AE1/AE3, cytokeratin 7, cytokeratin CAM 5.2, hematopoietic progenitor cell antigen CD34, also called MIC2, T cell surface glycoprotein E2, p30/32 protein (CD99), epithelial membrane antigen (EMA), desmin, alpha-smooth muscle actin, S100 protein, chromogranin A, and synaptophysin.