Paranasal sinus fibromatosis in a horse

Authors

  • B. J. Ahern,

    1. Department of Clinical Studies, New Bolton Centre, School of Veterinary Medicine, University of Pennsylvania, Kennett Square, Pennsylvania 19348; and New Jersey Equine Clinic, Millstone Township, New Jersey 08535, USA.
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  • J. Engiles,

    1. Department of Clinical Studies, New Bolton Centre, School of Veterinary Medicine, University of Pennsylvania, Kennett Square, Pennsylvania 19348; and New Jersey Equine Clinic, Millstone Township, New Jersey 08535, USA.
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  • J. J. Smith,

    1. Department of Clinical Studies, New Bolton Centre, School of Veterinary Medicine, University of Pennsylvania, Kennett Square, Pennsylvania 19348; and New Jersey Equine Clinic, Millstone Township, New Jersey 08535, USA.
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  • E. J. Parente

    1. Department of Clinical Studies, New Bolton Centre, School of Veterinary Medicine, University of Pennsylvania, Kennett Square, Pennsylvania 19348; and New Jersey Equine Clinic, Millstone Township, New Jersey 08535, USA.
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Summary

A case of paranasal sinus fibromatosis in an 11-year-old Thoroughbred gelding is reported. At admission the gelding underwent a unilateral frontal sinusotomy and a paranasal sinus mass was extensively debulked. The mass was diagnosed via histopathology as a desmoid fibromatosis with bone invasion, reactive osteoclastic osteolysis and osteoproliferation. The gelding had radiographic evidence of slow recurrence of the mass 8 months post operatively. The histopathological appearance and short-term outcome are presented for this previously undiagnosed condition of the horse. Recognition of paranasal fibromatosis and the resultant differentiation from other types of paranasal sinus neoplasia may allow for improved prognostication of equine sinus lesions.

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