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Diniz SLP, Oliveira Filho HS, Santos KMOL, Duarte JLC, Oliveira RL, Pierezan F, Armién AG, Leal de Araújo J. Gross, histologic, and ultrastructural features of iridophoromas in Siamese fighting fish ( Betta splendens). Vet Pathol 2024:3009858241281887. [PMID: 39382086 DOI: 10.1177/03009858241281887] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/10/2024]
Abstract
Pigment-containing and light-reflecting cell neoplasms, generically termed chromatophoromas, affect fish, reptiles, and amphibians. Chromatophoromas of light-reflecting cells are named iridophoromas. In this study, we aimed to describe the gross, histologic, and ultrastructural findings of 71 cases of iridophoromas in farmed Siamese fighting fish (Betta splendens). Macroscopically, iridophoromas appeared as whitish, gray, or black friable masses or plaques in the fin, trunk/tail, or head of the fish. Forty-five tumors (63%) were malignant and invaded the adjacent skeletal muscle and/or metastasized to other organs, whereas 26 (37%) tumors were restricted only to the skin, but due to the cytologic similarity to the malignant counterpart, we were not able to classify them as malignant or benign. Sixty-five (91%) tumors were classified as iridophoromas, whereas 6 (8%) were diagnosed as mixed chromatophoromas. Despite immunolabeling for PNL-2, melan A, or S-100 failing to demonstrate antigen expression, ultrastructural analysis identified light-reflecting neoplastic cells, unequivocally confirming iridophoromas as the predominant tumor. The high incidence of iridophoromas in Siamese fighting fish from the same breeding facility, coupled with a higher occurrence in royal blue and fancy copper color patterns and in young males, suggests a potential genetic/hereditary factor in the tumorigenesis of these neoplasms.
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Orós J, Priestnall SL, Suárez-Bonnet A. Histopathological description of iridophoromas resembling skin nodule syndrome in Siamese fighting fish Betta splendens. DISEASES OF AQUATIC ORGANISMS 2022; 151:23-27. [PMID: 36047671 DOI: 10.3354/dao03686] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Intensive breeding of the Siamese fighting fish Betta splendens, a species that inhabits marshlands in Thailand and other countries in south-east Asia, was traditionally focused on game fighting because the males are very territorial, but has evolved to become mainly devoted to ornamental purposes. Recently, a preliminarily named 'skin nodule syndrome' (SNS) has been described affecting this fish species in Thailand, with multiple bacterial infections suggested, including 4 species of Mycobacterium spp., although the etiology remains elusive. Here we describe the histopathological and immunohistochemical characteristics of 2 iridophoromas in 2 male Siamese fighting fish that strongly resemble the lesions described for SNS. Immunohistochemical analysis yielded negative results for Melan-A, PNL-2, and S-100, likely due to species-specific reasons. The results for molecular detection of mycobacterial DNA were also negative in both cases. The published histological lesions of SNS are very similar to the 4 chromatophoromas that have been reported affecting this species since 2015. Taken together with the present cases, we hypothesize that the preliminarily named SNS in fighting fish may be characterized as invasive chromatophoromas, although the true etiology remains to be elucidated and could include infectious and non-infectious causes. Further studies are necessary to examine whether commercial breeding of Siamese fighting fish has resulted in a possible genetic origin.
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Affiliation(s)
- Jorge Orós
- Department of Morphology, Veterinary Faculty, University of Las Palmas de Gran Canaria, 35413 Arucas (Las Palmas), Spain
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Shokrpoor S, Rahmati Holasoo H, Soroori S, Marandi A, Imantalab B. Basal cell carcinoma in an albino pindani (Chindongo socolofi) and a cobalt-zebra (Maylandia callainos): Diagnostic imaging, clinical and histopathological study. JOURNAL OF FISH DISEASES 2022; 45:1251-1258. [PMID: 35633276 DOI: 10.1111/jfd.13657] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 04/25/2022] [Accepted: 04/27/2022] [Indexed: 05/12/2023]
Abstract
A female albino pindani (Chindongo socolofi) and female cobalt-zebra (Maylandia callainos) were referred to the Ornamental Fish Clinic with a soft tissue mass on their upper jaw. Also, during clinical examination, an unencapsulated intraoral soft tissue mass was observed in the cobalt-zebra cichlid. Digital radiography showed soft tissue masses and osteolytic lesions. Computed tomography (CT) imaging confirmed that osteolytic lesions occurred in skull bones of cobalt-zebra. Also, soft tissue mass invaded to the intraoral space. Histopathologically, a non-encapsulated, multilobulated and densely cellular neoplastic mass was identified. Extensive infiltration of neoplastic cells to the dermis and subcutaneous tissue was observed in both cases. The masses were composed of multiple coalescing nests, sheets, lobules and trabeculae of neoplastic cells within a fibrovascular stroma. The palisading basaloid neoplastic cells were markedly extended from the basal cells of the epidermis into the dermis and subcutis. The majority of the neoplastic cells had scant amounts of eosinophilic cytoplasm with indistinct margins, round to ovoid nuclei and typically a single small basophilic nucleolus. There was invasion of basaloid neoplastic cells into the bone tissue that caused osteolytic lesions. Mitotic figures were three to seven per high-power field. Epidermal basement membrane was periodic acid-Schiff (PAS) positive and neoplastic cell extension into the dermis was identified by the PAS staining. Fibrovascular stroma of the mass was also stained blue with Masson's trichrome. Based on histopathological and histochemical findings, the masses were diagnosed as infiltrative type of basal cell carcinoma (BCC).
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Affiliation(s)
- Sara Shokrpoor
- Department of Pathology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
| | - Hooman Rahmati Holasoo
- Department of Aquatic Animal Health, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
- Centre of Excellence for Warm Water Fish Health and Disease, Shahid Chamran University of Ahvaz, Ahvaz, Iran
| | - Sarang Soroori
- Department of Surgery and Radiology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
| | - Amin Marandi
- Department of Aquatic Animal Health, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
| | - Bahram Imantalab
- Faculty of Veterinary Sciences, Islamic Azad University, Science and Research Branch, Tehran, Iran
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Histological and Ultrastructural Description of Benign Adipocytic Tumors in Farmed Striped Sea Bream ( Lythognathus mormyrus). Animals (Basel) 2021; 11:ani11123413. [PMID: 34944190 PMCID: PMC8698149 DOI: 10.3390/ani11123413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Revised: 11/24/2021] [Accepted: 11/26/2021] [Indexed: 11/18/2022] Open
Abstract
Simple Summary Mesenchymal neoplasms of the skin are common tumors in domestic animals and often reported in fish pathology. Among them, lipomas are frequently observed, but the definition of their different histological features and their classification in fish are still in their primordial stages. In the present work, the authors describe different type of lipomas found in a wild stock of striped seabream and outline their key differential microscopical features. Two new types of lipoma never observed in fish pathology, defined as spindle cell lipoma and atypical spindle cell-like lipoma, are reported. Abstract Cutaneous neoplasms affecting wild striped bream (Lythognathus mormyrus) have been recorded after their introduction in a marine aquaculture farm in the Adriatic Sea. The tumors were evident on 24% of the reared fish, showing single or multiple nodules, with a diameter ranging between 0.5–4.0 cm. Histologically, all the neoplastic lesions were located in the stratum spongiosum of the dermis and were surrounded by a thin capsule of connective tissue. The tumors were predominantly composed of adipocytes grouped and surrounded by a thin net of fibroblasts and collagen fibers. In some lipomas a mixture of adipocytes and uniform spindle cells were also observed. Fibroblasts and collagen fibers, or spindle cells, showing few mitotic figures were mainly observed in other nodules. Three of the tumors showed bands of cells with elongated nuclei. Five neoplasms differed from the classic spindle cell lipoma due to the presence of scattered giant cells. These cells presented acidophilic abundant cytoplasm with multiple hyperchromatic nuclei showing a concentric “floret-like” arrangement. The tumors were further characterized by ultrastructural observations that allowed ruling out the presence of virus-like particles within the lesions. Histological features of the masses lead to the identification of four prevalent patterns of neoplasms: lipoma, fibrolipoma, spindle cell lipoma (SCL), and atypical spindle cell-like lipoma (ASCL). The different neoplasms could arise from the transformation of mesenchymal cells of dermal origin. To the author’s knowledge, this is the first report describing key differential histological and ultrastructural features of these neoplasms in striped sea bream.
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Shivley JM, Brookshire WC, Baumgartner WA. Mixed Chromatophoroma (benign irido-melanocytoma) in a male Siamese fighting fish, Betta splendens, Regan. JOURNAL OF FISH DISEASES 2021; 44:351-354. [PMID: 33226677 DOI: 10.1111/jfd.13303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Revised: 10/28/2020] [Accepted: 10/29/2020] [Indexed: 06/11/2023]
Affiliation(s)
- Jacob Michael Shivley
- Department of Clinical Sciences, Mississippi State University College of Veterinary Medicine, Starkville, MS, USA
| | - Wilson Cooper Brookshire
- Department of Clinical Sciences, Mississippi State University College of Veterinary Medicine, Starkville, MS, USA
| | - Wes Arend Baumgartner
- Veterinary Diagnostic Lab, University of Illinois, College of Veterinary Medicine, Urbana, IL, USA
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Ciambrone C, Chen LR, Tokarz DA, Lewbart GA. Chromatophoroma in a Siamese fighting fish (
Betta splendens
). VETERINARY RECORD CASE REPORTS 2019. [DOI: 10.1136/vetreccr-2019-000840] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Chelsea Ciambrone
- University of Illinois at Urbana‐Champaign College of Veterinary MedicineUrbanaIllinoisUSA
| | - Laura R Chen
- Population Health and PathobiologyNorth Carolina State University College of Veterinary MedicineRaleighNorth CarolinaUSA
| | - Debra A Tokarz
- Population Health and PathobiologyNorth Carolina State University College of Veterinary MedicineRaleighNorth CarolinaUSA
| | - Gregory A Lewbart
- Clinical SciencesNorth Carolina State UniversityRaleighNorth CarolinaUSA
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Rahmati-Holasoo H, Shokrpoor S, Masoudifard M, Davudypoor S, Vaseghi M. Telangiectatic osteosarcoma and renal adenocarcinoma in an Oscar (Astronotus ocellatus, Agassiz): Diagnostic imaging and immunohistochemical study. JOURNAL OF FISH DISEASES 2018; 41:1165-1172. [PMID: 29572933 DOI: 10.1111/jfd.12788] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2018] [Accepted: 01/08/2018] [Indexed: 05/12/2023]
Affiliation(s)
- H Rahmati-Holasoo
- Department of Aquatic Animal Health, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
| | - S Shokrpoor
- Department of Pathology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
| | - M Masoudifard
- Department of Surgery and Radiology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
| | - S Davudypoor
- Department of Surgery and Radiology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
| | - M Vaseghi
- Department of Clinical Sciences, Faculty of Veterinary Medicine, Shahid Chamran University of Ahvaz, Ahvaz, Iran
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Rahmati-Holasoo H, Shokrpoor S, Tavakkoli A, Vajhi A, Ebrahimzadeh Mousavi H. Liposarcoma or invasive lipomatosis in flower horn fish, hybrid cichlid: clinical, radiological, ultrasonographical and histopathological study. JOURNAL OF FISH DISEASES 2016; 39:309-315. [PMID: 25753688 DOI: 10.1111/jfd.12364] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2014] [Revised: 02/02/2015] [Accepted: 02/02/2015] [Indexed: 06/04/2023]
Abstract
Liposarcoma or invasive lipomatosis affecting three indoor aquarium fish (flower horn fish, hybrid cichlid) is characterized, by the presence of mature adipocytes of variable sizes and by an invasive behaviour, which affected internal organs and eyes of all cases. Detailed macroscopic, radiological, ultrasonographical and histopathological features are presented. All fish had bilateral exophthalmia with some masses around the eyes. Ultrasonography confirmed the presence of hyperechoic masses in the eyes. Histopathology of all cases described the presence of variable-sized adipose cells in the eyes. The suggested diagnosis is well-differentiated liposarcoma or invasive lipomatosis. This is the first report of liposarcoma or invasive lipomatosis in flower horn fish, hybrid cichlid.
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Affiliation(s)
- H Rahmati-Holasoo
- Department of Aquatic Animal Health, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
| | - S Shokrpoor
- Department of Pathology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
| | - A Tavakkoli
- Department of Surgery and Radiology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
| | - A Vajhi
- Department of Pathology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
| | - H Ebrahimzadeh Mousavi
- Department of Aquatic Animal Health, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
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