case_images: PMC10583517_01
case_images: Axial CT contrast scan showed a, well-defined mass with moderate and heterogeneous enhancement in the left semispinalis without calcifications.
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case_images: PMC10583517_01_10.1177_2050313X231205800-fig1.jpg
case_images: fig1-2050313X231205800
case_images: MRI showing an intramuscular lobulated and well-defined mass involving the left semispinalis muscle. The mass appears hyperintense on T2 Fat-Sat images (a,b) and demonstrates intense and heterogeneous enhancement on gadolinium-enhanced T1-weighted images (c) without any serpiginous flow voids.
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case_images: PMC10583517_01_10.1177_2050313X231205800-fig2.jpg
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case_images: T1-weighted images, high intense on T2 and T2 Fat-sat weighted images, and intense and heterogeneous enhancement on contrast-enhanced T1-weighted images (Figure 2). The mass was 64 mm x 54 mm x 41 mm in size.
case_images: Intramuscular hemangioma. (a) Grossly, the tumor has a heterogenous aspect with purple hemorrhagic areas, yellowish areas, and medium-sized vessels (yellow arrows). (b) Microscopically, the tumor shows skeletal muscle (black arrow) infiltrated by vascular channels, often small sized, (yellow asterisk), sometimes larger (black asterisk), filled with red blood cells. Note the presence of entrapped fat tissue (yellow arrow) (HE x 100).
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case_images: PMC10583517_01_10.1177_2050313X231205800-fig3.jpg
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case_images: The macroscopic mass examination showed a nodular tumor tissue with a purplish-brownish appearance, small-sized vascular channels, and intervening yellow fat (Figure 3).
case_images: Striated muscle tissue (black arrows) dissociated by vascular proliferation, often capillary (yellow stars), sometimes cavernous (black stars), and gorged with red blood cells (HE x 25). At high magnification, vascular structures are bordered by turgid endothelial cells with no atypia or mitosis (HE x 100).
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case_images: PMC10583517_01_10.1177_2050313X231205800-fig4.jpg
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case_images: The histological examination found a mixture of large, dilated, medium, and small vascular channels that were trapped between skeletal muscle fibers with admixed adipose tissue (Figure 4).