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Journal of Comparative Pathology

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https://www.readbyqxmd.com/read/28942310/dental-and-temporomandibular-joint-pathology-of-the-north-american-brown-bear-ursus-arctos-horribilis-ursus-arctos-middendorffi-and-ursus-arctos-sitkensis
#1
J N Winer, B Arzi, S Döring, P H Kass, F J M Verstraete
Museum specimens (maxillae and mandibles) from 393 North American brown bears (Ursus arctos) from Alaska were examined macroscopically according to predefined criteria and 204 specimens were included in this study. The specimens were acquired between 1905 and 2012. There were 99 specimens (48.5%) from male animals, 87 (42.7%) from female animals and 18 (8.8%) from animals of unknown sex. The ages of the animals ranged from neonate to adult, with 92 adults (45.1%) and 112 young adults (54.9%) included and neonates/juveniles excluded from the study...
August 2017: Journal of Comparative Pathology
https://www.readbyqxmd.com/read/28942309/benign-bilateral-adenomyoepithelioma-of-the-mammary-gland-in-a-ring-tailed-lemur-lemur-catta
#2
A Suárez-Bonnet, E Rodríguez Grau-Bassas, P Herráez, O Quesada-Canales, S L Priestnall, A Espinosa de Los Monteros
Naturally occurring mammary tumours are uncommon in prosimians. A 20-year-old female ring-tailed lemur (Lemur catta) developed bilateral enlargement of the mammary glands. Surgical removal revealed that both masses were comprised of multiple nodules and cystic areas that entirely replaced the normal glands. Histologically, a benign neoplastic biphasic cellular proliferation, composed of luminal-epithelial and basal-myoepithelial components, was identified. Immunohistochemical analysis for expression of cytokeratin (CK) AE1/AE3, CK7, CK5 + 8, CK14, vimentin, p63 and 14-3-3σ highlighted the biphasic nature of the neoplasm...
August 2017: Journal of Comparative Pathology
https://www.readbyqxmd.com/read/28942308/multi-organ-metastasis-of-fibrolamellar-hepatocellular-carcinoma-in-a-malayan-gharial-tomistoma-schlegelii
#3
A A Ahmad, G M Dorrestein, S J W Y Oh, C D Hsu
A 38-year-old Malayan gharial (Tomistoma schlegelii) with a 2-week history of anorexia was found dead and presented for post-mortem examination. Numerous white firm nodules of various sizes were found on the surface of the liver, both left and right kidneys, the spleen and the serosa of the intestinal tract. All masses had similar microscopical appearance and were diagnosed as metastasizing fibrolamellar hepatocellular carcinoma. Immunohistochemically, the tumour cells did not react with antibodies specific for pan-cytokeratin, vimentin or HepPar-1...
August 2017: Journal of Comparative Pathology
https://www.readbyqxmd.com/read/28942307/renal-interstitial-lipid-accumulation-in-cats-with-chronic-kidney-disease
#4
A L Martino-Costa, F Malhão, C Lopes, P Dias-Pereira
Chronic kidney disease (CKD) is a common progressive condition described in dogs and cats, involving several non-specific morphological and histological lesions. Recently, renal interstitial lipid accumulation was reported in cats with CKD; however, to date, little is known about this condition and its pathogenesis. The aim of this study was to investigate the occurrence and to characterize renal interstitial lipid deposits in dogs and cats. A total of 49 animals (27 cats and 22 dogs) with CKD were included in the study...
August 2017: Journal of Comparative Pathology
https://www.readbyqxmd.com/read/28942306/systemic-mycobacterium-kansasii-infection-in-a-domestic-shorthair-cat
#5
S-H Lee, D-M Go, S-H Woo, H-T Park, E Kim, H S Yoo, D-Y Kim
A 1-year-old, female domestic shorthair cat was presented with anorexia, depression and weight loss, accompanied by multifocal nodules affecting the face, pinnae and periarticular tissue. Routine medical treatments were ineffective. The animal's physical condition continued to deteriorate and it finally died. Post-mortem examination revealed multifocal to coalescing firm nodules with occasional ulceration affecting the ears, peri-ocular areas, nasal planum, oral cavity and laryngopharyngeal region. Tan-coloured, firm, nodular lesions were also observed in the periarticular tissue, lungs and tracheobronchial and mediastinal lymph nodes...
August 2017: Journal of Comparative Pathology
https://www.readbyqxmd.com/read/28942305/role-of-components-of-the-insulin-like-growth-factor-system-in-the-early-stages-of-ovarian-follicular-persistence-in-cattle
#6
F M Rodríguez, N C Gareis, G J Hein, N R Salvetti, A N Amweg, E Huber, A F Stassi, H H Ortega, F Rey
Cystic ovarian disease (COD) is one of the main causes of infertility in dairy cattle. It has been postulated that the insulin-like growth factor (IGF) system may contribute to follicular persistence and development of COD. The initiation of the IGF response is a result of interactions between IGF-binding proteins (IGFBPs) and IGFBP proteases, mainly pregnancy-associated plasma protein A (PAPP-A). IGFBPs bind IGFs with high affinity and consequently regulate their access to IGF receptors (IGFRs). The aim of this research was to determine variations in components of the IGF system in the ovaries of cows with persistent follicles induced by long-term administration of progesterone...
August 2017: Journal of Comparative Pathology
https://www.readbyqxmd.com/read/28942304/neospora-caninum-and-bovine-neosporosis-current-vaccine-research
#7
V Marugan-Hernandez
Neospora caninum, a tissue cyst-forming parasite, is the causative agent of bovine neosporosis. It is considered to be one of the most important transmissible causes of reproductive failure in cattle; abortion and neonatal mortality result in significant economic losses within the cattle industry worldwide. The balance between acute (mediated by the tachyzoite stage) and persistent (mediated by the bradyzoite stage) phases of the infection is influenced by the immune status of the animal, and for pregnant cows (the intermediate host) immune status is critical for transplacental (i...
August 2017: Journal of Comparative Pathology
https://www.readbyqxmd.com/read/28942303/lymphoma-koala-retrovirus-infection-and-reproductive-chlamydiosis-in-a-koala-phascolarctos-cinereus
#8
J Fabijan, L Woolford, S Lathe, G Simmons, F Hemmatzadeh, D J Trott, N Speight
Koala retrovirus (KoRV) infection, thought to be associated with lymphoid neoplasia, and Chlamydia pecorum-related ocular and urogenital disease are both highly prevalent in eastern Australian koala (Phascolarctos cinereus) populations. However, in South Australian koalas, little is known about KoRV infection and C. pecorum-associated disease. We report the first South Australian case of lymphoma in a KoRV-A-positive female koala also affected by severe reproductive chlamydiosis. The koala was from the Mount Lofty Ranges population and was presented with hindlimb lameness...
August 2017: Journal of Comparative Pathology
https://www.readbyqxmd.com/read/28942302/congenital-cutaneous-panadnexal-papillomatous-hamartomas-in-a-calf
#9
I B Veiga, M Welle, J S Agerholm
Several cauliflower-like alopecic masses arose on the head of an otherwise healthy, full-term newborn Jersey × Belgian blue heifer, which was humanely destroyed shortly after birth due to the severity of the skin lesions. Microscopically, the masses were composed of multiple papillary projections displaying well-differentiated sebaceous glands surrounded by a moderate number of well-developed sweat glands, as well as embryonic and fully developed, but dysplastic hair follicles. Thick branching connective tissue stalks supported these adnexal components...
August 2017: Journal of Comparative Pathology
https://www.readbyqxmd.com/read/28942301/the-journal-of-comparative-pathology-educational-trust-and-petplan-charitable-trust-joint-research-award-in-veterinary-pathology
#10
EDITORIAL
M J Day
No abstract text is available yet for this article.
August 2017: Journal of Comparative Pathology
https://www.readbyqxmd.com/read/28942300/annular-stenotic-oesophageal-squamous-cell-carcinoma-in-cattle-exposed-naturally-to-bracken-fern-pteridium-arachnoideum
#11
T C Faccin, E K Masuda, J V M Piazer, S M P Melo, G D Kommers
Oesophageal squamous cell carcinomas (SCCs) may be observed as exophytic masses or ulcerative or infiltrative endophytic neoplasms. However, in cattle, there is also an uncommon gross presentation as an annular stenotic thickening of the oesophageal wall. Thirteen cases of annular stenotic oesophageal SCC in cattle grazing in bracken fern (Pteridium arachnoideum) areas are reported. The lesions consisted of endophytic masses, focally extensive, firm and circumferential (annular) in the oesophageal wall. Pronounced wrinkling of the mucosa, with retracted uneven areas and subsequent luminal narrowing (stenosis), was observed in all cases...
August 2017: Journal of Comparative Pathology
https://www.readbyqxmd.com/read/28942299/pathological-findings-in-wild-rats-rattus-rattus-captured-at-guafo-island-northern-chilean-patagonia
#12
M Seguel, F Muñoz, E Paredes, M J Navarrete, N L Gottdenker
The black rat (Rattus rattus) is an invasive species and potential reservoir of significant pathogens of man, domestic animals and wildlife. During the 2012-2014 austral summers, 201 black rats were captured and examined on the uninhabited Guafo Island, in Northern Chilean Patagonia (43.593029°S, 74.713481°W). The mite Ornithonyssus bacoti caused lymphoplasmacytic and eosinophilic dermatitis in all infected rats (105/210, 52%), but no skin lesions were observed in rats infected with Nosopsyllus spp. and Plocopsylla spp...
August 2017: Journal of Comparative Pathology
https://www.readbyqxmd.com/read/28942298/immunohistochemical-expression-profiles-of-cell-adhesion-molecules-matrix-metalloproteinases-and-their-tissue-inhibitors-in-central-and-peripheral-neoplastic-foci-of-feline-mammary-carcinoma
#13
S Pisamai, A Rungsipipat, N Kunnasut, G Suriyaphol
Feline mammary carcinoma (FMC) is a common cancer with high metastatic potential and high mortality rate. Loss of cell-cell interactions and degradation of the extracellular matrix by proteinases enhances tumour invasion and metastasis. Peripheral neoplastic foci (PNF) are defined as the presence of discrete tumour cell clusters, splitting off from central neoplastic foci (CNF) and lodging around these CNF. PNF therefore locate at the tumour-host interface at the site of invasion. The aim of this study was to evaluate immunohistochemically the expression of cell adhesion molecules (e-cadherin [CDH-1], syndecan 1 [SDC-1] and nectin-2), matrix metalloproteinases (matrix metalloproteinase [MMP]-2, MMP-7 and MMP-9) and their tissue inhibitors (tissue inhibitor of matrix metalloproteinase [TIMP]-1 and TIMP-2) together with the cellular proliferation marker, Ki67, in CNF and PNF of FMCs of different clinical stages and histological grades...
August 2017: Journal of Comparative Pathology
https://www.readbyqxmd.com/read/28942297/ameloblastoma-of-the-jaw-in-three-species-of-rodent-a-domestic-brown-rat-rattus-norvegicus-syrian-hamster-mesocricetus-auratus-and-amargosa-vole-microtus-californicus-scirpensis
#14
B Murphy, A Michel, E B LaDouceur, C Bell, M Lin, D M Imai
Ameloblastoma is a locally aggressive tumour derived from the odontogenic epithelium of the developing tooth germ. This uncommon odontogenic tumour is generally considered benign, but rarely, both distant metastasis and cytological atypia occur and this malignant version is referred to as malignant ameloblastic carcinoma. Here we document a spontaneous malignant ameloblastic carcinoma in a rat (Rattus norvegicus) with metastasis to the submandibular lymph node. We also describe ameloblastomas in two other muroid rodents, an Amaragosa vole (Microtus californicus scirpensis) and a Syrian hamster (Mesocricetus auratus)...
August 2017: Journal of Comparative Pathology
https://www.readbyqxmd.com/read/28942296/primary-urinary-bladder-osteosarcoma-in-a-dog
#15
M Woldemeskel
A 13-year-old, female Welsh corgi had a clinical history of haematuria and cystitis for 2-3 months. A 4 × 3 × 2 cm mass was excised surgically from the apex of the urinary bladder. A primary urinary bladder osteosarcoma was diagnosed histologically. Primary urinary bladder osteosarcoma is a rare tumour in man and animals. To the author's knowledge, there is no previously published report of a primary canine urinary bladder osteosarcoma.
August 2017: Journal of Comparative Pathology
https://www.readbyqxmd.com/read/28942295/systemic-amyloidosis-in-an-african-tiger-snake-telescopus-semiannulatus
#16
R E Burns, P M Gaffney, K P R Nilsson, A G Armién, A P Pessier
An adult male African tiger snake (Telescopus semiannulatus) was diagnosed with disseminated mycobacteriosis and a hepatic biliary cystadenocarcinoma. Histologically, the spleen was largely replaced by extracellular deposits of eosinophilic, fibrillar to hyaline material. Similar material was also present in the testicular interstitium and occasional blood vessel walls. This material was congophilic with strong green birefringence under polarized light and emitted fluorescence when bound to the luminescent-conjugated oligothiophene, h-FTAA, an amyloid binding probe...
August 2017: Journal of Comparative Pathology
https://www.readbyqxmd.com/read/28942294/histopathological-and-immunohistochemical-study-of-trichoblastoma-in-the-rabbit
#17
M K Kok, J K Chambers, N Ushio, A Watamori, Y Miwa, H Nakayama, K Uchida
Trichoblastoma is the most common skin tumour in the rabbit. The aim of the present study was to characterize the histological and immunohistochemical features of trichoblastoma in 27 rabbits. Common sites of tumour occurrence were the neck (6/30, 20%), head (5/30, 16.7%), flank (4/30, 13.3%) and hindlimb (4/30, 13.3%). Histologically, rabbit trichoblastoma was categorized into ribbon (10/30, 33.3%), trabecular (8/30, 26.7%) and mixed types (12/30, 40%). The tumour tissue showed close interaction with the surrounding stroma where prominent fibroblastic aggregation, known as papillary mesenchymal bodies, was frequently observed (24/30; 80%)...
August 2017: Journal of Comparative Pathology
https://www.readbyqxmd.com/read/28942293/immunohistochemical-profile-of-20-feline-renal-cell-carcinomas
#18
J A Ramos-Vara, E F Edmondson, M A Miller, D M Dusold
Renal cell carcinoma (RCC) is uncommon in cats, but makes up the majority of epithelial neoplasms in the kidney. The immunohistochemical profile of 20 feline RCCs (13 tubular carcinomas, four tubulopapillary carcinomas, one papillary carcinoma and two anaplastic carcinomas) was evaluated. Primary antibodies used were specific for Pax8, KIT, CD10, cytokeratins and vimentin. A polymer-based immunoperoxidase procedure was used. Nineteen tumours (95%) expressed Pax8; 12 (60%), KIT; 15 (75%), CD10; 20 (100%), cytokeratins; and 19 (95%), vimentin...
August 2017: Journal of Comparative Pathology
https://www.readbyqxmd.com/read/28942292/tularaemia-in-european-brown-hares-lepus-europaeus-and-mountain-hares-lepus-timidus-characterized-by-histopathology-and-immunohistochemistry-organ-lesions-and-suggestions-of-routes-of-infection-and-shedding
#19
G Hestvik, H Uhlhorn, F Södersten, S Åkerström, E Karlsson, E Westergren, D Gavier-Widén
Tularaemia is an emerging zoonotic infectious disease caused by the bacterium Francisella tularensis. In Sweden, hares are considered to be key species in the epidemiology of tularaemia. The aim of this study was to characterize the pathology of natural tularaemia infection in European brown hares (EBHs) (Lepus europaeus) and mountain hares (MHs) (Lepus timidus) in Sweden, in order to better understand the presentation of disease and the routes of infection, body dissemination and shedding of F. tularensis...
August 2017: Journal of Comparative Pathology
https://www.readbyqxmd.com/read/28673487/experimental-infection-of-goats-with-a-newly-isolated-strain-of-akabane-virus-that-causes-encephalomyelitis
#20
H Jeong, J-K Oem, M-S Yang, D Yang, M-S Kim, K-H Lee, M-H Lee, C-W Lim, B Kim
In 2010, there was a large-scale outbreak of bovine encephalomyelitis in Korea, and 15 new strains of Akabane virus (AKAV) were isolated. To identify the pathogenicity of one of these strains, we infected adult goats with AKAV-7 via different routes. Twenty-five female goats were used in this study and were divided into five groups: intracerebral (IC) and intrasubarachnoid (IS) viral inoculation (n = 8 each), intravenous (IV) inoculation (n = 4), and vaccinated before IV inoculation (n = 4), in addition to a negative control animal...
August 2017: Journal of Comparative Pathology
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