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Light micrographs (Masson's trichrome with aniline blue staining) showing (a) the mesenchymal tissue with star‐shaped cells (arrows) immersed in abundant extracellular matrix (hashtag), with an evident septum of connective tissue (asterisk). (b) Vimentin positive star‐shaped cells. Scale bar: a: 9 μm; b: 20 μm
