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Peritoneal Mesothelioma in a Free-Ranging American Black Bear (Ursus americanus). J Wildl Dis 2021; 57:230-233. [PMID: 33635984 DOI: 10.7589/jwd-d-20-00014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Accepted: 06/07/2020] [Indexed: 11/20/2022]
Abstract
We necropsied an American black bear (Ursus americanus) from central Utah, US and found several liters of cloudy fluid and multiple white nodules in the peritoneal cavity. Histopathologic examination and staining with pancytokeratin and vimentin markers identified a peritoneal mesothelioma. Mesothelioma has not been reported previously in black bears.
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COMPOSITION OF CEREBROSPINAL FLUID IN CLINICALLY NORMAL GRIZZLY BEARS ( URSUS ARCTOS HORRIBILIS). J Zoo Wildl Med 2021; 50:739-741. [PMID: 33517649 DOI: 10.1638/2018-0231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/09/2019] [Indexed: 11/21/2022] Open
Abstract
Five cerebrospinal fluid (CSF) samples were collected from four clinically normal grizzly bears from the Washington State University Bear Research, Education, and Conservation Center. CSF samples were collected from the cerebellomedullary cisternal space. Samples were immediately processed and analyzed for microprotein content, red blood cells, white blood cells (WBCs), and differential cell count. Microprotein concentration (range 4.2-14.6 mg/dl; median, less than 6 mg/dl), total WBC count (range 0-2 cells/µl; median 2 cells/µl), and differential WBCs (predominance mononuclear cells) of the five CSF samples were comparable to previously published CSF analyses from clinically normal felines and canines. Providing documentation of CSF composition for clinically normal grizzly bears is important for neurologic disease diagnosis and treatment.
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McHale B, Armién AG, Clarke LL, Rissi DR. Embryonal central nervous system tumor in the brain of a goose. J Vet Diagn Invest 2018; 31:385-389. [PMID: 30204056 DOI: 10.1177/1040638718799390] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Embryonal central nervous system (CNS) tumor is a rare malignant neoplasm that arises from the neural crest. Herein we describe an embryonal tumor in the brain of an adult male domestic goose ( Anser anser) that was euthanized after a short history of wandering and lethargy. Grossly, a focal, bright-red, soft plaque was present on the ventral aspect of the brain, extending from the optic chiasm to the midbrain, as well as into the dorsal neuroparenchyma. Histologically, the nodule consisted of a poorly demarcated population of neoplastic cells arranged in streams and bundles, and occasionally palisading around small capillaries (pseudorosettes). Neoplastic cells were elongate and had scant, finely granular, eosinophilic cytoplasm, and elongate nuclei with dense chromatin. Mitoses were uncommon. Scattered foci of intratumoral necrosis and microvascular proliferation were present. Neoplastic cells were immunoreactive for doublecortin and neuronal nuclei. Ultrastructurally, neoplastic cells had elongated-to-polyhedral cytoplasm with short processes, scarce intermediate filaments, and small round mitochondria and rough endoplasmic reticulum. The cell membrane had varied numbers of intercellular anchoring-like junctions, and nuclei were round-to-elongate and had marginal aggregates of heterochromatin. Morphologic, immunohistochemical, and ultrastructural findings in our case are consistent with a poorly differentiated embryonal tumor.
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Affiliation(s)
- Brittany McHale
- Department of Pathology (McHale, Clarke, Rissi) and Athens Veterinary Diagnostic Laboratory (Rissi), University of Georgia, College of Veterinary Medicine, Athens, GA.,Veterinary Diagnostic Laboratory, Department of Veterinary Population Medicine, University of Minnesota, College of Veterinary Medicine, St. Paul, MN (Armién)
| | - Anibal G Armién
- Department of Pathology (McHale, Clarke, Rissi) and Athens Veterinary Diagnostic Laboratory (Rissi), University of Georgia, College of Veterinary Medicine, Athens, GA.,Veterinary Diagnostic Laboratory, Department of Veterinary Population Medicine, University of Minnesota, College of Veterinary Medicine, St. Paul, MN (Armién)
| | - Lorelei L Clarke
- Department of Pathology (McHale, Clarke, Rissi) and Athens Veterinary Diagnostic Laboratory (Rissi), University of Georgia, College of Veterinary Medicine, Athens, GA.,Veterinary Diagnostic Laboratory, Department of Veterinary Population Medicine, University of Minnesota, College of Veterinary Medicine, St. Paul, MN (Armién)
| | - Daniel R Rissi
- Department of Pathology (McHale, Clarke, Rissi) and Athens Veterinary Diagnostic Laboratory (Rissi), University of Georgia, College of Veterinary Medicine, Athens, GA.,Veterinary Diagnostic Laboratory, Department of Veterinary Population Medicine, University of Minnesota, College of Veterinary Medicine, St. Paul, MN (Armién)
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LAPAROSCOPIC-ASSISTED INSERTION OF A VENTRICULOPERITONEAL SHUNT IN A RESCUED ASIATIC BLACK BEAR (URSUS THIBETANUS) IN LAOS. J Zoo Wildl Med 2017; 48:897-901. [PMID: 28920775 DOI: 10.1638/2016-0147.1] [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: 11/21/2022] Open
Abstract
A 3-yr-old Asiatic black bear (Ursus thibetanus), weighing 68 kg, underwent a laparoscopic-assisted placement of a ventriculoperitoneal shunt for hydrocephalus in the Lao People's Democratic Republic. Rescued as a young cub with a notably domed head, the bear's condition had deteriorated with age, but euthanasia was not a viable option because of cultural issues. Surgery was attempted as a palliative measure. The bear had ventrally orientated crossed eyes (abducens nerve palsy and dorsal midbrain syndrome), papilledema, severe rhinorrhea, depressed mentation, lethargy, a very poor appetite, and was stunted. Hydrocephalus was confirmed via intraoperative 2.0-5.0 MHz head ultrasound, as no magnetic resonance imaging was available in the country. Surgery was planned via 3D modeling of museum skulls and brain cavity, and ultrasound examination of formalin-preserved brains of other carnivores with hydrocephalus. The bear demonstrated a notable improvement in mentation, appetite, and behavior, maintained for 4 yr following surgery.
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