PMC9106126_01
A 42-year-old man with AMF. On T1-weighted images, the tumor reveals low signal intensity but high signal intensity in some circuitous strips (A). On coronal fat-saturated T2-weighted images and sagittal T2-weighted images, the tumor is well-marginated with high inhomogeneous signal intensity (B,C). DWI shows a low-signal tumor (D). The images of contrast-enhanced MRI show a heterogeneous and distinctly enhanced mass. As time goes on, the enhancement of the tumor is more obvious (E,F).
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F1
It appeared hypointense with few vascular flow empty shadows and hypersignal areas on T1-weighted images (Figure 1A). T2-weighted images on the MRI scan, the tumor was heterogeneous hyperintense and well-marginated (Figures 1B,C). The mass showed no restricted diffusion on diffusion weighted imaging (DWI) (Figure 1D). Contrast-enhanced MRI images showed a non-homogenous but markedly enhanced mass with progressive enhancement (Figures 1E,F).
Hematoxylin-eosin (HE) staining and immunohistochemistry of the tumor. Thin-walled blood vessels surrounded by several spindle cells can be seen in the images (A,B). Image A and Image B represent 50x and 100x, respectively. The desmin is positive in immunohistochemistry (C).
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F2
Microscopically, the tumor was rich in thin-walled and small-size blood vessels (Figures 2A,B). Hyperplastic spindle cells could be seen around the vessels (Figure 2B). Tumor cells displayed positive for desmin (Figure 2C), CD34, and Ki67 proliferation index of about 1%.