Figure 2.

Histopathology evaluation of the pleural rhabdomyoma. (A) The tumor is attached to the pleura (HE, ×20 original magnification); (B) haphazardly arranged muscle fibers in pleura, with an extensive mucinous degeneration of the mesenchyme (HE, ×40 original magnification); (C) individual skeletal muscle differentiation with cross-striation is noted. Note the elongated, round, oval, to polygonal cells with bright eosinophilic cytoplasm and an eccentric nucleus (HE, ×200 original magnification); (D) note the highlighted cross striation by Masson staining (×400 original magnification); (E) IHC stain for myoD1 is positive (×400 original magnification); (F) IHC stain for desmin is positive (×400 original magnification).