Cavernous haemangioma of thymus : A rare vascular tumour in a cross bred cow

A six-year-old cross bred Jersey cow was presented for necropsy. On examination of thoracic cavity, pericardium over the base of the heart revealed dark reddish, firm, tortuous mass embedded in thoracic part of thymus surrounded by adipose tissue. Histopathological of the tissue revealed thymus with involution changes. Lobes were shrunken. Capsule was thin and was surrounded and infiltrated by adipocytes. Thymic lobules were shrunken, follicles were atrophied. Cortex and medulla were non-de- lineated containing condensed area composed of epithelial cells, Hassall’s corpuscles and thymocytes. Cystic degenerations were noticed in Hassel’s Corpuscles, epithelial cells and stromal tissue. Thymocytes were arranged to form acinar pattern. Atrophic thymus showed variable sized vascular channels filled with blood. The vascular channels were lined by endothelial cells. The stroma composed of fat and fibrous tissues admixed with remnant of thymic tissue and follicles. Based on the location, gross and histopathological features of the tissue, the case was diagnosed as cavernous haemangioma of thymus in a cross bred Jersey cow.