An 8 yr old spayed female Italian greyhound was presented with a mass in the cranial abdomen. Preliminary evaluation of the dog revealed a large, cavitary, irregularly shaped mass with no definitive association with any abdominal organs. During an exploratory celiotomy, a 16 cm × 12 cm × 6 cm mass was removed. On subsequent histopathology, extraskeletal osteosarcoma induced by a foreign body granuloma was diagnosed. The foreign body granuloma, based on histopathological findings, was suspected to be secondary to a retained surgical sponge from her routine ovariohysterectomy performed 7 yr prior to presentation. Animals with granulomas induced by foreign bodies can remain asymptomatic for years; however, those granulomas can progress to extraskeletal osteosarcomas, which carry a poor prognosis.
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September/October 2015
Case Reports|
September 01 2015
Extraskeletal Osteosarcoma Induced by a Foreign Body Granuloma
Jennifer E. Slovak, DVM, MS, DACVIM;
Jennifer E. Slovak, DVM, MS, DACVIM
From the Department of Veterinary Clinical Sciences (J.E.S., N.R.K.) and Department of Veterinary Pathology (J.H.), College of Veterinary Medicine, Iowa State University, Ames, IA.
*Jennifer E. Slovak's present affiliation is Washington State University College of Veterinary Medicine, Pullman, WA.
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Nina R. Kieves, DVM, DACVS;
Nina R. Kieves, DVM, DACVS
From the Department of Veterinary Clinical Sciences (J.E.S., N.R.K.) and Department of Veterinary Pathology (J.H.), College of Veterinary Medicine, Iowa State University, Ames, IA.
†Nina R. Kieves' present affiliation is Colorado State University College of Veterinary Medicine, Ft. Collins, CO.
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Joseph Haynes, PhD, DVM
Joseph Haynes, PhD, DVM
From the Department of Veterinary Clinical Sciences (J.E.S., N.R.K.) and Department of Veterinary Pathology (J.H.), College of Veterinary Medicine, Iowa State University, Ames, IA.
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J Am Anim Hosp Assoc (2015) 51 (5): 315–319.
Citation
Jennifer E. Slovak, Nina R. Kieves, Joseph Haynes; Extraskeletal Osteosarcoma Induced by a Foreign Body Granuloma. J Am Anim Hosp Assoc 1 September 2015; 51 (5): 315–319. doi: https://doi.org/10.5326/JAAHA-MS-6224
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