A 35-day-old Holstein-Friesian calf had shown progressive abdominal di
stension for two weeks. On admission, the calf showed signs of abdomin
al discomfort. Haemorrhagic fluid was obtained by parcentesis and cont
ained 2.8 G.L-1. leucocytes. At both laparotomy and autopsy (after eut
hanasia) a mesothelioma was found.