Fig. 3

a. The tumour consisted of a mixture of spindle cell and epithelioid components with intraluminal eosinophilic material mimicking carcinosarcoma (hematoxylin and eosin stain, 75×). b. The focal slit-like structures in some areas (indicated by the arrow, hematoxylin and eosin stain, 150×). c. The spindle cells showing eosinophilic cytoplasm and round to oval nuclei with nuclear pleomorphism and with mitoses readily observed (hematoxylin and eosin stain, 300×). d. The epithelioid element was the main component in most areas, composed of well-differentiated glandular structures with lighter cytoplasm, admixed with some spindle components (hematoxylin and eosin stain, 300×). e. Close to the tumour’s border only glandular structures were present, mimicking adenocarcinoma (hematoxylin and eosin stain, 300×). f. The coronary artery (indicated by the arrow) was observed to be encompassed by the tumour, and thrombus was present in the lumen (hematoxylin and eosin stain, 75×)