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. 2017 Jun 28;5(5):e00248. doi: 10.1002/rcr2.248

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© 2017 The Authors. Respirology Case Reports published by John Wiley & Sons Australia, Ltd on behalf of The Asian Pacific Society of Respirology

This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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Pathology of the tumour. (A) Haematoxylin and eosin (HE) stain of the tumour shows that the tumour arose from the intimal of pulmonary artery (50×). The black arrow indicates the neoplasm from the artery wall. (B) Microscopically, the tumour was composed of pleomorphic spindle cells (HE stain, 200×). (C) Tumour cells were immunohistochemically positive for α‐smooth muscle actin (SMA). (D) Immunostaining for vimentin (VIM) highlights numerous neoplasm cells derived from mesenchymal tissue.