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a Immunostaining of the spindle-shaped cells at the site of growth showed AE1/AE3 positivity (original magnification, ×100). b Immunostaining of the spindle-shaped cells at the site of growth showed vimentin positivity (original magnification, ×100). c Immunostaining of the spindle-shaped cells at the site of growth showed partial p40 positivity (original magnification, ×100).
