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Case Reports
. 2012 May;53(5):549-53.

Primary cutaneous undifferentiated round cell tumor with concurrent polymyositis in a dog

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Case Reports

Primary cutaneous undifferentiated round cell tumor with concurrent polymyositis in a dog

Paola Gianella et al. Can Vet J. 2012 May.

Abstract

A cutaneous poorly differentiated round cell tumor with concurrent, non-suppurative, polymyositis was diagnosed in a hovawart dog. Histochemical staining, immunohistochemistry, and transmission electron microscopy findings suggested that the tumors cells were of myeloid, or possibly natural killer cell origin. The possibility that the concurrent polymyositis may represent a pre-neoplastic or paraneoplastic process is discussed.

Tumeur cutanée primaire indifférenciée à cellules rondes avec polymyosite concomitante chez un chien. Une tumeur cutanée à cellules rondes mal différenciée avec polymyosite non suppurative concomitante a été diagnostiquée chez un chien Hovawart. Les résultats de la coloration histochimique, de l’immunohistochimie et de la microscopie électronique à transmission ont suggéré que les cellules de la tumeur étaient d’origine myéloïde ou possiblement des cellules tueuses naturelles. La possibilité que la polymyosite concomitante puisse représenter un processus néoplasique ou paranéoplasique est examinée.

(Traduit par Isabelle Vallières)

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Figures

Figure 1
Figure 1
Ulcerated cutaneous lesion caudal to the left scapula.
Figure 2
Figure 2
Section of the cranial tibial muscle. There are endomysial inflammatory infiltrates composed of macrophages, lymphocytes and rare neutrophils, associated with phagocytosis of non-necrotic fibers and myonecrosis (H&E, Bar = 100 μm).
Figure 3
Figure 3
Haired skin, deep dermis: multifocal aggregates of round neoplastic cells invading vascular walls and associated with microhemorrhages and necrosis (H&E, Bar = 50 μm).
Figure 4
Figure 4
Ulcerated lesions of the preputial skin and glans penis.
Figure 5
Figure 5
Electron micrograph of a skin biopsy: note the electron-dense granules (arrow) and rough endoplasmic reticulum (arrowhead) within the cytoplasm of a neoplastic cells (Uranyl acetate and lead citrate, Bar = 0.3 μm).

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