Changes

**Mainly cattle and dogs, occasionally in other species

**Mainly cattle and dogs, occasionally in other species

**Can be congenital in calves

**Can be congenital in calves

**Arise from serosa of pericardial, [[Pleural Cavity & Membranes Hyperplastic and Neoplastic - Pathology|pleural]] and [[Peritoneal cavity - Anatomy & Physiology|peritoneal cavities]]  

**Arise from serosa of pericardial, [[Pleural Cavity & Membranes Hyperplastic and Neoplastic - Pathology|pleural]] and [[Peritoneal Cavity - Anatomy & Physiology|peritoneal cavities]]  

**Multiple small nodules, may be pedunculated, few milimeters to few centemeters, may present as villous projections

**Multiple small nodules, may be pedunculated, few milimeters to few centemeters, may present as villous projections

**May be associated with milky or bloody effusions

**May be associated with milky or bloody effusions