case_images: PMC10493048_01
case_images: Imaging studies. Anteroposterior (a) and lateral (b) plain radiographs of the left leg showed a markedly calcified lesion. T1-weighted (c) and T2-weighted (d) axial magnetic resonance imaging demonstrating a well-circumscribed lesion within the peroneus longus muscle. (e) T1-weighted axial imaging with fat suppression revealed that the lesion was strongly enhanced after gadolinium injection.
case_images: 10.1177_2050313X231197529-fig1.jpg
case_images: PMC10493048_01_10.1177_2050313X231197529-fig1.jpg
case_images: fig1-2050313X231197529
case_images: Plain radiography demonstrated a slightly lobulated soft tissue lesion with clear margins, smooth borders, and marked heterogeneous calcification with a calcified rim (Figure 1).
case_images: Pathological findings of the tumor. (a) Histological appearance of the core needle biopsy specimen showed cellular and disarrayed pattern of spindle-shaped tumor cells resembling normal smooth muscle cells with foci of calcification (H&E staining, x100). (b) A large, hard, encapsulated tumor with gyriform lobulation. (c) The cut surface of the tumor was finely lobulated with yellowish, calcific areas spread throughout. (d) Microscopy demonstrating spindle-shaped tumor cells with oval or cigar-shaped nuclei (H&E staining, x400). (e) Concentric calcification was observed throughout the tumor (H&E staining, x100).
case_images: 10.1177_2050313X231197529-fig2.jpg
case_images: PMC10493048_01_10.1177_2050313X231197529-fig2.jpg
case_images: fig2-2050313X231197529
case_images: A core needle biopsy performed preoperatively to assess for malignancy revealed spindle cells resembling normal smooth muscle cells densely proliferating in bundle-like arrangements (Figure 2). Macroscopic examination of the excised tumor demonstrated a huge, hard tumor measuring 15.0 x 6.0 x 4.5 cm in size with expansive growth within a thin, fibrous capsule and numerous feeder vessels on its surface (Figure 2).