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No papillomavirus-DNA detected in feline sarcoids
Feline sarcoids or fibropapillomas were thought to be caused by papilloma virus. A group from Germany and Canada doubted this opinion and tried to identify the virus by PCR in 12 tumours. The result: There are parallels to equine sarcoids, and no virus could be found in the hyperplastic epithelium of these tumours.

We examined 12 formalin-fixed paraffin-embedded feline skin tumours which had the histopathological features of fibropapillomas for the presence of papillomavirus (PV) DNA using touchdown polymerase chain recation (PCR), DNA sequencing and nonradioactive in situ hybridization.

Nine of the tumours contained a 102-bp PCR product demonstrated using consensus PV primers that amplify a portion of the L1 gene. The nucleotide sequences are closely related, but not identical to that of ovine PV type 2, rabbit oral PV and reindeer PV. The deduced amino acid sequences had strong homologies with the major capsid protein L1 of deer PV, bovine papillomavirus (BPV) 1 and BPV 2, and European elk PV.

Although PV antigens were not detected in any of the tumours by immunohistochemistry, PV DNA was demonstrated in individual mesenchymal cells or cell nests of 4/12 tumours by in situ hybridization. A nonproductive infection of mesenchymal fibroblast-like tumour cells with a papillomavirus would explain the lack of PV antigen expression and the absence of PV DNA in the hyperplastic epithelium.

Because these tumours and their pathogenesis are similar to equine sarcoids, we suggest that they should be reclassified as `feline sarcoids` instead of fibropapillomas.


Source: Teifke, Jens P., Kidney, Beverly A., Löhr, Christiane V. & Yager, Julie A. (2003): Detection of papillomavirus-DNA in mesenchymal tumour cells and not in the hyperplastic epithelium of feline sarcoids. In: Veterinary Dermatology 14 (1), 47-56



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SMALL ANIMAL PRACTICE

Patient-specific facemask to facilitate brain biopsymembers
The objective of this pilot study was to describe the application and first preliminary data of a novel MRI and CT compatible patient-specific facemask for stereotactic brain biopsy of intracranial lesions in dogs. Five client-owned dogs presenting for neurological deficits consistent with forebrain disease were included in the study. All dogs had MRI findings consistent with an intracranial lesion. But biopsies in this region are not easy to obtain. Does an individual face mask help?

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