Lymphangiosarcoma in a horse

A 15-year-old Dutch Warmblood mare presented with respiratory distress and anorexia. Clinical examination revealed liquothorax and an abdominal mass. At necropsy, an infiltrating: tumour was round in the visceral trunk, conti nuing through the diaphragm into the mediastinum. Histopathology, immunohis tochemistry and electronmicroscopy showed empty channels lined Ly atypical endothelial cells, and neoplastic cells in a disorganized pattern, consiste nt with the diagnosis of a lymphangiosarcoma. (C) 2000 Harcourt Publishers Ltd.