EQUINE VETERINARY EDUCATION / AE / JANUARY 2017
7
Case Report Preputial fibroma in a gelding
A. De Meyer†, S. Vandenabeele‡, C. Ververs†, A. Martens§, K. Roels†, V. De Lange†,M. Hoogewijs†, C. De Schauwer† and J. Govaere†* †Department of Reproduction, Obstetrics and Herd Health; ‡Department of Small Animal Medicine and Clinical Biology; and §Department of Surgery and Anaesthesiology of Domestic Animals, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium. *Corresponding author email:
jan.govaere@
Ugent.be
Keywords: horse; skin; tumour; fibroma; scrotum; stallion
Summary An 11-year-old gelding presented with a large mass located in the dermis of his preputium that surrounded the penis completely. This mass was first noted years ago but did not
increase in size. Histological examination diagnosed a fibroma. No treatment was initiated since no signs of discomfort were noticed and the gelding was performing at a high level in competitive showjumping. Next to skin tumours, tumours of the penis and preputium are most common. Most frequently, squamous cell carcinomas and sarcomas are diagnosed. Although fibromas can develop anywhere in connective tissue, a preputial location of a fibroma in a gelding is rare. Differential diagnosis and possible treatment options are discussed.
Case report
An 11-year-old gelding presented with an enlarged preputium. The condition had been present for at least 3 years without noticeable growth in the last 6 months. Three years earlier, the mass had been biopsied and histopathologically diagnosed as chronic, non-encapsulated and non-ulcerating inflammation with formation of granulation tissue and fibrosis. The gelding was in good body and general condition and
was able to extend his penis to urinate without signs of discomfort. The glans and shaft of the penis exhibited no abnormalities. The preputium size was enlarged up to 30 9 20 9 15 cm. The mass was well circumscribed and located in the dermis and surrounded the penis completely (Fig 1). It was firm on palpation and on the right ventral side a number of small ulcerated papulae were present on the thickened and haired skin surface. On ultrasonography, the structure was homogenous with
a moderate echodensity except for one small zone on the ventrolateral left side where a denser focal zone without distinct contours could be visualised. No abnormalities could be palpated or ultrasonographically visualised at the regional and inguinal lymph nodes to indicate the presence of metastases. A fine needle aspiration sample revealed mesenchymal
cells (fibroblasts) without signs of malignancy. Deep biopsy samples were taken by means of a double punch biopsy from the firm mass after making an incision in the skin surrounding the mass. These tissue samples showed a well vascularised mesenchymal proliferation with entangled collagen fibres with a low cellularity. Fibroblasts had hyperchromatic nuclei with a plump aspect and small
Fig 1: Clinical aspect of the preputial fibroma.
Fig 2: Histological photomicrograph. Note bundles of fibroblasts and sparsely cellular nature of the mass. Haematoxylin and eosin stain, 20 3.
nucleoli. Polymerase chain reaction (PCR) for bovine papilloma virus was negative. Based on clinical history, signs and the histological findings, a fibroma was diagnosed (Fig 2).
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