Category:Liver Nematodes

these cause damage during migration through the liver

Ascaris suum

• Ascariasis
• 'milk spot' liver
• pigs
• common incidental finding at post mortem examination
• affected livers are condemned at meat inspection

Gross

• initial haemorrhagic tracts through the liver attributed to the migration of ascarid larvae
• later stages show fibrosis of these tracts as poorly defined, diffuse, white spots on the capsular surface

Microscopically

• initial haemorrhage and necrosis of parenchyma along the tracts
• later repair by fibrous tissue at foci
• inflammatory cell response contains many eosinophils, as well as lymphocytes and macrophages

Strongyles

• horses
• it is common to find fibrous tags incidentally on the liver surface and adjacent diaphragm
• these are remnants of fibrous repair following the egress of the parasites from the liver