PMC5220413_01
Axial (a) and coronal (b) T1 views of an MRI of the lesion in the context of the right adductor magnus muscle, with sparse areas of necrosis and irregular contrast enhancement.
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fig1
An MRI with contrast enhancement of the right thigh was obtained, including T1- and T2-weighted as well as fat suppression images, which revealed the presence of a 9.0 x 6.0 x 5.0 cm lesion in the right adductor magnus muscle, with sparse areas of necrosis and irregular contrast enhancement (Figure 1).
Gross appearance of the resected specimen. (a) Superficial view; (b) deep view; (c) sectioning of the mass, showing central necrosis and macrocystic change (1-6: proximal to distal).
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fig2
Upon sectioning, it showed central necrosis and macrocystic change (Figure 2).
Cellular neoplasm, arranged in fascicles and whorls, with high mitotic rate (arrows indicate mitotic figures). (A) Hematoxylin-eosin stain. (B), (C), and (D) immunohistochemical staining for c-KIT, CD34, and S100, respectively. All images were captured under 200x original magnification.
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fig3
The neoplastic cells were arranged in either a fascicular or a whirling pattern and exhibited spindle and epithelioid morphology (Figure 3(A)). Immunohistochemically, the tumor cells were strongly positive for c-KIT and CD34, focally positive for SMA, and negative for desmin and S100 (Figure 3(B, C, and D)).