Although neoplasms are commonly reported in domestic hamsters, retrospective studies approaching spontaneous tumors with data regarding epidemiological findings are scarce. The present study aimed to describe the epidemiological and pathological findings of 40 cases of tumors in domestic hamsters diagnosed in a veterinary pathology laboratory in Southern Brazil from 2002 to 2019. Chinese hamster (Cricetulus griseus) was the most commonly affected species (16/40), followed by Djungarian hamster (Phodopus sungorus, 11/40) and Syrian hamster (Mesocricetus auratus, 4/40). Among the cases, 57.5% were females (23/40), while 42.5% were males (17/40). The affected hamsters’ median age was of 14-months old, with an age range of 8- to 36-months old. Twenty-four cases were assessed as anatomopathological samples (biopsies), while 16 were composed of carcasses submitted to postmortem examination, and, therefore, the neoplasm was related to the cause of death. The integumentary system was frequently affected (60%, 24/40), followed by the female reproductive tract (22.5%, 9/40), hematopoietic system (10%, 4/40), digestive tract (5%, 2/40), and endocrine system (2.5%, 1/40). The most frequent neoplasm was squamous cell carcinoma (35%, 14/40), mostly on the lip/nasal region (50%, 7/14). Other tumors included fibrosarcoma (10%, 4/40), lymphoma (10%, 4/40), mammary cystadenoma (10%, 4/40), apocrine sweat gland adenoma (7.5%, 3/40), hemangiosarcoma (5%, 2/40), leiomyosarcoma (5%, 2/40), and granulosa ovarian cell tumor (5%, 2/40). The five remaining cases occurred individually and were composed of hepatoid gland adenoma, solid thyroid carcinoma, cutaneous melanoma, ovarian teratoma, and cutaneous trichoblastoma. Neoplasms were identified as an important cause of death and major reason to perform biopsy in domestic hamsters in Southern Brazil.
Diseases related to the alimentary system are the main cause of death in horses. This retrospective study aimed to describe the pathological findings of fatal parasite-induced enteritis and typhlocolitis caused by cyathostominae, Eimeria leuckarti, Balantidium coli, and Strongyloides westeri in horses. The records of parasite-induced intestinal lesions in horses necropsied in Southern Brazil between 2005 and 2017 were reviewed. Ten horses had fatal parasitic enteritis and/or typhlocolitis, and the main causes were: cyathostominae typhlocolitis (6/10), E. leuckarti enteritis (1/10), S. westeri enteritis (1/10), B. coli colitis related to cyathostominae (1/10), and infection by multiple agents (1/10). Cyathostominae typhlocolitis showed marked mucosal thickening, with multifocal elevated nodules containing tangled filiform parasites. Microscopic examination revealed that the mucosa and submucosa had encysted parasitic structures surrounded by eosinophilic and granulomatous inflammation. E. leuckarti enteritis was microscopically characterized by macrogamonts, microgamonts, and oocysts inside the host cells. S. westeri enteritis showed microscopic atrophy of the villi with numerous mucosal encysted parasitic structures. B. coli typhlocolitis showed severe diffuse mucosal reddening, with microscopic superficial mucosal necrosis associated with multiple protozoan trophozoites. Fatal parasite-induced enteritis and typhlocolitis are important causes of death in horses in Southern Brazil.
Meningiomas are neoplasms that commonly involve the central nervous system of cats, while cholesteatomas are nodular granulomatous chronic lesions within the choroid plexus that are rarely reported in cats. This study described a case of cholesteatoma and non-communicating hydrocephalus associated to a third ventricle meningioma in a cat. Clinically, the cat had a 2-year history of behavioral changes, photophobia and motor incoordination. At the necropsy, a tan-brown mass totally occluded the third ventricle, causing a severe dilation of the lateral ventricles (non-communicating hydrocephalus). Microscopically, the mass was composed by a neoplastic proliferation of spindle cells arranged in bundles, containing in the center psammomatous bodies (meningioma), while in the adjacent areas a cholesteatoma was observed, which was characterized by multiple cholesterol cleft formation, hemosiderosis and associated granulomatous inflammation. At immunohistochemistry (IHC), neoplastic cells had a marked immunostaining for vimentin, while were negative for cytokeratin and S100. The diagnosis of transitional meningioma occurring in association to cholesteatoma and non-communicating hydrocephalus in a cat was obtained mainly by the histological and IHC features. These are important methods to distinguish this condition from other neurological disorders in cats.
This report described the clinical and pathological aspects of open spina bifida and diplomyelia along with multiple congenital malformations in a Texel lamb. Clinically, paresis of the thoracic limbs, paralysis of the pelvic limbs and a cutaneous opening in the lumbosacral region were observed. At necropsy, there was a focally extensive disruption of the skin associated with an absence of the dorsal portions of the lumbosacral vertebrae. Additionally, diplomyelia of the lumbar segment, mild hydromyelia of thoracic segment, and moderate communicating hydrocephalus of the lateral and third ventricles were noted. Possible viral etiologies (bovine viral diarrhea virus, bluetongue virus, and Schmallemberg virus) were not detected by RT-PCR, and toxic plants were not identified. Therefore, a possible genetic cause may not be discarded.
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