Snout Chondroma in a Neon Tetra Paracheirodon innesi

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  • Sirri Rubina
    Servizio di Prova di Anatomia Patologica, Department of Veterinary Public Health and Animal Pathology, Faculty of Veterinary Medicine, Alma Mater Studiorum University of Bologna
  • Mandrioli Luciana
    Servizio di Prova di Anatomia Patologica, Department of Veterinary Public Health and Animal Pathology, Faculty of Veterinary Medicine, Alma Mater Studiorum University of Bologna
  • Bacci Barbara
    Servizio di Prova di Anatomia Patologica, Department of Veterinary Public Health and Animal Pathology, Faculty of Veterinary Medicine, Alma Mater Studiorum University of Bologna
  • Morini Maria
    Servizio di Prova di Anatomia Patologica, Department of Veterinary Public Health and Animal Pathology, Faculty of Veterinary Medicine, Alma Mater Studiorum University of Bologna
  • Bettini Giuliano
    Servizio di Prova di Anatomia Patologica, Department of Veterinary Public Health and Animal Pathology, Faculty of Veterinary Medicine, Alma Mater Studiorum University of Bologna

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Abstract

An adult neon tetra Paracheirodon innesi with a history of difficulty in feeding caused by a mass overwhelming the snout is presented. Macroscopically the fish presented a unilateral, single, nodular and well-circumscribed, perlaceous, firm to hard mass in the left snout region. Histologically, tumor tissue was formed mainly by abundant, highly cellular elliptic nests of chondrocytes lying in mature hyaline cartilage matrix. Besides this component there were bubbly appearing large cells (physaliphorous-like cells) and a minority of cells having well defined cytoplasmic boundaries, clear eosinophilic pale cytoplasm and a rounded centrally located nucleus (“fried egg-like cells”). Alcian-PAS and Masson’s trichrome stains were applied to demonstrate proteoglycans and collagen of the matrix. Based on topographic localization and histomorphological features, a diagnosis of snout chondroma was made. This case can be added to the other rare spontaneous cartilage tumors of fish described in literature.

Journal

  • Fish Pathology

    Fish Pathology 45 (2), 84-87, 2010

    The Japanese Society of Fish Pathology

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