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. 2023 Dec 1;115(6):325–332. doi: 10.32074/1591-951X-941

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Figure 5. — Immunohistochemical study confirmed the myogenic differentiation of the neoplasm. (A) Strong and diffuse cytoplasmic stain for h-caldesmon (clone E89, Ventana). (B) Strong and diffuse cytoplasmic stain for desmin (clone DE-R-11, Ventana). (C) Strong and diffuse membranous and cytoplasmic stain for smooth muscle actin (clone 1A4, Ventana). (D) Evidence of tubular and cleft-like spaces of entrapped respiratory epithelium by immunohistochemical staining for TTF1 (clone SP141, Ventana). (E) Immunohistochemical evidence of hmga2 nuclear overexpression in tumor cells (No. 41878, Abcam). (F) Low proliferation index (Ki-67) (clone 30-9, Ventana) in about 10% of the study population. (A, B, C, E, F) Original magnifications x50. (D) Original magnifications x200.