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Pathological findings. (A) Histopathological examination showing the characteristic “patternless pattern” of non-atypical spindle-shaped tumor cells on a collagenous background (hematoxylin and eosin; original magnification, ×200); (B) pleural lavage cytology showing mild inflammation involving the presence of lymphocytes, proliferation of histiocytes, and mitosis of mildly atypical tumor cells (Papanicolaou stain; original magnification, ×40).
