title: Ultrastructural assessment of granulomas in the liver of perch (Perca fluviatilis) Infected by tapeworm.
abstract: Granulomas caused by migration of larvae of a helminth parasite, Triaenophorus nodulosus, within the liver of perch (Perca fluviatilis) from Rimov Dam Lake (Czech Republic) were assessed by transmission electron microscopy. Lesions were found in the liver of 29 out of 34 perch examined (85.2%) and there were between 1 and 15 T. nodulosus larvae identified per host. Pathological changes were more severe in livers containing more granulomas. Within the granulomas, there were three concentric regions: an outer layer of fibrous connective tissue, a middle clear epithelioid layer and a central dark spindle cell layer. The outer layer contained mast cells, fibroblasts, thick collagen bundles and epithelioid cells. The granulomas contained few lymphocytes and macrophages. Hepatocytes adjacent to the granulomas showed pronounced degeneration (ranging from vacuolar degeneration to acute cellular swelling).
authors.affiliation: Department of Life Sciences and Biotechnology, University of Ferrara, Ferrara, Italy. Electronic address: dzb@unife.it.
authors.forename: B S
authors.initials: BS
authors.lastname: Dezfuli
authors.affiliation: Faculty of Biosciences, Agro-Alimentary and Environmental Technologies, University of Teramo, Teramo, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Manera
authors.affiliation: Department of Life Sciences and Biotechnology, University of Ferrara, Ferrara, Italy.
authors.forename: L
authors.initials: L
authors.lastname: Giari
mesh_terms: D000818:Animals; D002590:Cestode Infections / Q000473:pathology*; D005393:Fish Diseases / Q000469:parasitology / Q000473:pathology*; D006099:Granuloma / Q000469:parasitology / Q000473:pathology*; D008107:Liver Diseases / Q000469:parasitology / Q000473:pathology*; D046529:Microscopy, Electron, Transmission; D010471:Perches
keywords: liver; parasitic granuloma; perch; ultrastructure