Fig. 2From: Pulmonary artery sarcoma resected via median sternotomy with thoracoscopic assistance a Microscopy shows a hypercellular pattern of pleomorphic spindle cells and epithelioid cells with prominent nuclei and mitotic figures (hematoxylin and eosin stain). b Immunohistochemical staining displays focal positivity for alpha-SMA. c The Ki-67 proliferation index was 30%Back to article page