Fig. 4From: Invasive pleural malignant mesothelioma with rib destruction and concurrent osteosarcoma in a dogPhotomicrograph of the mesothelioma. Several clusters of epithelioid cells, sometimes arranged as tubules and glandular-like structures, are seen embedded within a prominent fibrotic reaction. Hemorrhagic foci are also observed throughout the neoplastic lesion. Hematoxylin and eosin, Obj ×40Back to article page