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by Jenni78 on 11 September 2011 - 14:09
The "case studies" on the chipmenot.org site are less than convincing in most cases.
by hunger4justice on 11 September 2011 - 15:09
by hunger4justice on 11 September 2011 - 15:09
Neoplasia and Granulomas Surrounding Microchip Transponders in Damaraland Mole Rats (Cryptomys damarensis)
+ Author Affiliations
- Radhakrishna Sura, The Dow Chemical Company, 1803 Building, Washington Street, Midland, MI 48674 Email: RSura@dow.com
Abstract
Damaraland mole rats (Cryptomys damarensis) are among the longest-living rodents, with a maximum longevity of approximately 16 years. As one of the few mammals termed eusocial, these animals have been used in behavioral, genetic, metabolic, and physiologic research at the University of Connecticut since 1997. For individual identification at 3 to 4 months of age, mole rats were subcutaneously implanted with microchip transponders (11 mm in length) in the dorsal cervical region. In 2007, 2 of the 90 implanted adults, 10-year-old and 9-year-old females, developed subcutaneous masses at the site of the implant. Histopathological and immunohistochemical examinations revealed amelanotic melanoma and fibrosarcoma, respectively, with metastasis of the amelanotic melanoma. In 2008, a total of 3 adult males were castrated as part of a sex behavior study; 3 months later, all 3 castrated males developed subcutaneous masses around their implants, whereas none of the noncastrated males had masses. After an additional 9 months, these masses were found to
by hunger4justice on 11 September 2011 - 15:09
Microchip-associated fibrosarcoma in a cat
Article first published online: 2 MAY 2011
DOI: 10.1111/j.1365-3164.2011.00975.x
© 2011 The Authors. Veterinary Dermatology. © 2011 ESVD and ACVD
Issue
Veterinary Dermatology
Early View (Online Version of Record published before inclusion in an issue)
Additional Information(Show All)
How to CiteAuthor InformationPublication History
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Sources of Funding This study is self-funded.
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Conflict of Interest No conflicts of interest have been declared.
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by hunger4justice on 11 September 2011 - 15:09
49(5): 638–641. Published online 2010 September.
PMCID: PMC2949435
Copyright © American Association for Laboratory Animal Science
Microchip-Associated Sarcoma in a Shrew (Suncus murinus)
Leah K Schutt and Patricia V Turner*
Department of Pathobiology, University of Guelph, Guelph, Canada
*Corresponding author. Email: pvturner@uoguelph.ca
Received December 14, 2009; Revised January 20, 2010; Accepted February 3, 2010.
Abstract
A 16-mo-old female house musk shrew (Suncus murinus) with a 1-wk history of a rapidly growing subcutaneous mass in the interscapsular region was euthanized and submitted for necropsy. Macroscopic examination identified an irregular, well-demarcated, solid, tan-white subcutaneous mass. A small cavity containing a microchip device was present at the center of the mass. In addition, massive splenomegaly was evident grossly. Histologically, the subcutaneous mass comprised spindle cells arranged in a storiform pattern of interweaving bundles, consistent with a high-grade soft tissue sarcoma with multifocal necrosis. Immunohistochemical investigation suggested that the neoplastic cells were positive for neuron-specific enolase and (rarely) α-smooth muscle actin and negative for cytokeratin, desmin, S100, and vimentin. In light of the mesenchymal histopathologic phenotype and the lack of specific immunoreactivity pattern, the mass was considered to be most consistent with a poorly differentiated sarcoma. To our knowledge, this is the first report of a microchip-associated soft tissue sarcoma in a shrew.
House musk shrews (Suncus murinus) are members of the order Insectivora that are similar in stature to mice and range in size from 22 to 48 g. Anatomic features that characterize this species are small eyes, a long pointed snout, gray-brown to black fur, and a long hairy tail.by hunger4justice on 11 September 2011 - 15:09
A Case of Interscapular Fibrosarcoma in a Dwarf Rabbit (Oryctolagus Cuniculus)
- Claudio Petterino1
- Paola Modesto2
- Daniela Strata3
- Marta Vascellari4
- Franco Mutinelli4
- Angelo Ferrari2
- Alessandra Ratto⇓2
- 1Department of Public Health, Comparative Pathology and Veterinary Hygiene, School of Veterinary Medicine, University of Padua, AGRIPOLIS, Legnaro, Padua, Italy
- 2The National Reference Centre of Veterinary and Comparative Oncology, CEROVEC-Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle D'Aosta, Genoa, Italy
- 3Private veterinary practice, Recco, Genoa, Italy
- 4The Histopathology Department, Istituto Zooprofilattico Sperimentale delle Venezie, Legnaro, Padua, Italy
- ↵National Reference Centre of Veterinary and Comparative Oncology, CEROVEC-Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle D'Aosta, Piazza Borgo Pila, 39 int. 24, Torre B, 16129 Genova, Italy. alerat16@libero.it
by GranvilleGSD on 11 September 2011 - 15:09
Jenni beat me to it mentioning that a common injection site for vaccines is the same area as the microchip implantation site. I've seen a few vaccine related tumors over the years. I'd also like to mention, that the chips are very often implanted incorrectly, especially in the case of shelter animals or chip clinics where the people implanting the chips are often volunteers with no medical training. They are supposed to be implanted into the muscle layer, not just the subcutaneous layer. Just jabbing the needle under the skin puts it into the sub-q layer, which allows for the chip to travel or migrate to other areas such as the armpit, as well as fall out of the hole it was implanted into before it scabs over.
Edit to add: Also, the shoulder area is where topical flea products are applied. Something else to think about.
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