|
Macroscopic and Histopathological Characterization of Extragonadal Teratoma in Guppy (Poecilia reticulata)
|
Sara Shokrpoor *   , Hooman Rahmati-Holasoo , Samansa Salehi , Zahra Harsani , Reza Nahavandi |
| 1. Department of Pathology and Clinical Pathology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran |
|
|
Abstract: (194 Views) |
| Teratomas are rare neoplasms in fish that originate from multiple embryonic germ layers and may develop in either gonadal or extragonadal locations. This study describes the macroscopic and histopathological features of a spontaneous extragonadal teratoma in a guppy (Poecilia reticulata) presented following unexplained mortality. Clinical examination revealed a firm, ovoid abdominal mass located between the pectoral and pelvic fins and attached to the abdominal wall. The mass contained fin-like structures and exhibited two distinct chromatophore pigmentation patterns. The affected fish, together with the mass, was fixed in 10% neutral buffered formalin and processed using routine histopathological techniques. Microscopic examination confirmed the diagnosis of teratoma through the identification of well-differentiated tissues derived from multiple embryonic germ layers. Although teratomas have been reported in both male and female fish, their pathogenesis remains poorly understood. Environmental exposure to teratogenic chemicals, cytotoxic compounds, and infectious agents has been suggested as potential contributing factors. This report expands the limited available data on extragonadal teratomas in ornamental fish and highlights the importance of histopathological evaluation in the diagnosis of uncommon neoplastic conditions in aquatic species. |
|
| Keywords: Guppy, Extragonadal teratoma, Ornamental fish, Histopathology, Fish neoplasia. |
|
|
Full-Text [PDF 536 kb]
(56 Downloads)
|
Type of Study: Research |
Subject:
Special
Received: 2025/12/29 | Accepted: 2026/03/30 | Published: 2026/05/30
|
|
|
|
|
|
|
| Send email to the article author |
|
|
|
| Add your comments about this article |
|
|
|
