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Glomus Tumor in the Digit of a Cat

Abstract

A solitary mass approximately 1.5 x 2 cm located on the outer side of the third digit of the left forepaw of a 7-year-old male cross-breed cat was examined pathologically. The excised tumor mass was hard and white and located within the deep dermis and subcutis. Histopathologically, the mass consisted of a mixed population of small round epithelioid cells arranged in ribbon- or cordlike structures and spindle-shaped cells forming loose irregular bundles in a mucinous stroma. The epithelioid cells were often arranged around small blood vessels. Neoplastic cells were intensely positive for vimentin and alpha smooth muscle actin and negative for keratin, desmin, S-100 protein, and neuron-specific enolase. Based on these pathologic features, the tumor was diagnosed as a glomus tumor, a neoplasm not previously reported in cats and extremely rare in animals.

Key words: Arteriovenous anastomosis; cats; glomus tumor.

Request reprints from Dr. K. Uchida, Department of Veterinary Pathology, Faculty of Agriculture, Miyazaki University, Miyazaki 889-2155 (Japan). E-mail: a0d423u{at}cc.miyazaki-u.ac.jp.

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