title: Occurrence of spontaneous tumours of the renal proximal tubules in oscars Astronotus ocellatus.
abstract: This report describes the occurrence of renal papillary cystic adenomas and adenocarcinomas in oscars Astronotus ocellatus Cuvier, 1829. Samples from 5 oscars with abdominal swelling were collected between 1996 and 2004 and compared to a published case from the USA. Macroscopically, all cases revealed a large, well-demarcated, greyish-brown nodular mass in a retroperitoneal position within the body cavity, and originating from the posterior kidney. Histologically, these neoplasms were composed of epithelial cells, which were arranged in papillary cystic tubular structures and partly covered by cilia. In this study, microscopic and ultrastructural examination confirmed that the origin of the neoplasm was the proximal tubules of the kidney.
authors.affiliation: Schwarzenhaidestrasse 41, 1230 Vienna, Austria. oliver.hochwartner@chello.at
authors.forename: Oliver
authors.initials: O
authors.lastname: Hochwartner
authors.forename: Gerhard
authors.initials: G
authors.lastname: Loupal
authors.forename: William H
authors.initials: WH
authors.lastname: Wildgoose
authors.forename: Heike
authors.initials: H
authors.lastname: Schmidt-Posthaus
mesh_terms: D000236:Adenoma / Q000473:pathology / Q000662:veterinary*; D000818:Animals; D023681:Cichlids; D005260:Female; D005393:Fish Diseases / Q000473:pathology*; D007680:Kidney Neoplasms / Q000473:pathology / Q000662:veterinary*; D008297:Male