Abstract
During the period January 1st 1972 to July 31st 1977 in the Department of Pathology of the College of Veterinary Medicine in Helsinki, 23 of 1168 dogs were diagnosed at necropsy as having haemangiosarcoma. This was confirmed macroscopically, histologically and, in 3 dogs, electron-microscopically. These dogs had haemangiosarcomas and metatases in several organs: lungs (17 dogs), spleen (14), liver (14), peritoneum, especially omentum (12), kidneys (11), myocardium (9), subcutis (9), brain (7), adrenals (2), urinary bladder (1), prostate (1), pleura (1) and femur (1). The haemangiosarcomas were large, soft, grey to dark red, and nodular and contained haemorrhages and areas of necrosis. Many of the dogs had died due to extensive haemorrhage into the peritoneal cavity, pericardium or brain. The histological picture of the tumours varied within and between dogs, from a rather benign haemangioma to very malignant haemangiosarcoma or non-specific sarcoma. Haemangiosarcomas in 3 of the dogs are described ultrastructurally. The increased prevalence and possible environmental factors mentioned in the literature are discussed.
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