title: Tetrathyridiosis and tubulopapillary carcinoma occurring simultaneously in the mammary gland of a cat.
abstract: This report describes a case of tubulopapillary carcinoma and concomitant tetrathyridiosis in a 5-year-old female cross-breed cat. A mass was located at right inguinal mammary gland and measured 5.5 × 5 × 3 cm in size with multilobulated to solid appearance. The cut surface of the mass had a centrally located large cyst (approximately 3 cm in diameter) surrounded by other smaller cysts. Histologically, the mass was diagnosed as tubulopapillary mammary carcinoma, intensely positive for AE1/AE3 cytokeratins. The cyst found at post-mortem examination was tetrathyridia of Mesocestoides species surrounded by inflammatory cells and a loose fibrous capsule. To the authors' best knowledge, this is the first description of a tubulopapillary carcinoma and tetrathyridiosis found simultaneously in the mammary gland of a cat.
authors.affiliation: Department of Pathology, Faculty of Veterinary Medicine, University of Adnan Menderes, Aydin, Turkey. havci@adu.edu.tr
authors.forename: H
authors.initials: H
authors.lastname: Avci
authors.forename: N
authors.initials: N
authors.lastname: Toplu
mesh_terms: D000818:Animals; D002291:Carcinoma, Papillary / Q000145:classification / Q000473:pathology / Q000662:veterinary*; D002371:Cat Diseases / Q000469:parasitology / Q000473:pathology*; D002415:Cats; D002590:Cestode Infections / Q000469:parasitology / Q000473:pathology / Q000662:veterinary*; D005260:Female; D015674:Mammary Neoplasms, Animal / Q000473:pathology*; D008645:Mesocestoides