title: ULTRASONOGRAPHIC FEATURES OF CANINE GASTROINTESTINAL STROMAL TUMORS COMPARED TO OTHER GASTROINTESTINAL SPINDLE CELL TUMORS.
abstract: Canine gastrointestinal stromal tumors (GISTs) are a recent subtype of gastrointestinal spindle cell tumor recognized with the increasing use of immunohistochemistry. To our knowledge, no imaging features have been described in immunostochemically confirmed canine GISTs. The objective of this retrospective, cross-sectional study was to describe ultrasonographic features of canine GISTs compared with other spindle cell tumors. Thirty-seven dogs with an ultrasonographically visible gastrointestinal mass and a histopathologic diagnosis of spindle cell neoplasia were examined. Immunohistochemistry staining was performed for retrieved tissue samples to further differentiate the tumor type and each sample was interpreted by a single veterinary pathologist. Ultrasonographic features recorded examined included mass echogenicity, homogeneity, presence of cavitation, layer of origin, bowel wall symmetry, and loss of wall layering, location, size, vascularity, and evidence of perforation or ulceration. Tumor types included 19 GISTs, eight leiomyosarcomas, six leiomyomas, and four nonspecified sarcomas. Gastrointestinal stromal tumors were significantly more likely to be associated (P < 0.03) with abdominal effusion than other tumor types. There was overlap between the anatomical locations of all tumors types with the exception of the cecum where all eight tumors identified were GISTs. Besides location, there were no unique ultrasound features of GISTs that would allow distinction from other gastrointestinal spindle cell tumors. Similar to previous studies, GISTs appeared to be the most common spindle cell tumor associated with the cecum in our sample of dogs. The high frequency of abdominal effusion with GIST's was of unknown etiology could possibly have been due to septic peritonitis.
authors.affiliation: Tufts Cummings School of Veterinary Medicine, North Grafton, MA, 01536.
authors.forename: Joshua
authors.initials: J
authors.lastname: Hobbs
authors.affiliation: Tufts Cummings School of Veterinary Medicine, North Grafton, MA, 01536.
authors.forename: James
authors.initials: J
authors.lastname: Sutherland-Smith
authors.affiliation: Tufts Cummings School of Veterinary Medicine, North Grafton, MA, 01536.
authors.forename: Dominique
authors.initials: D
authors.lastname: Penninck
authors.affiliation: Tufts Cummings School of Veterinary Medicine, North Grafton, MA, 01536.
authors.forename: Samuel
authors.initials: S
authors.lastname: Jennings
authors.affiliation: Tufts Cummings School of Veterinary Medicine, North Grafton, MA, 01536.
authors.forename: Lisa
authors.initials: L
authors.lastname: Barber
authors.affiliation: University of Massachusetts, Worcester, MA, 01655.
authors.forename: Bruce
authors.initials: B
authors.lastname: Barton
mesh_terms: D000818:Animals; D002430:Cecal Neoplasms / Q000662:veterinary; D003430:Cross-Sectional Studies; D004283:Dog Diseases / Q000000981:diagnostic imaging*; D004285:Dogs; D004379:Duodenal Neoplasms / Q000662:veterinary; D005260:Female; D005354:Fibrosarcoma / Q000662:veterinary; D005770:Gastrointestinal Neoplasms / Q000000981:diagnostic imaging / Q000662:veterinary*; D046152:Gastrointestinal Stromal Tumors / Q000000981:diagnostic imaging / Q000662:veterinary*; D007150:Immunohistochemistry; D007580:Jejunal Neoplasms / Q000662:veterinary; D007889:Leiomyoma / Q000662:veterinary; D007890:Leiomyosarcoma / Q000662:veterinary; D008297:Male; D012004:Rectal Neoplasms / Q000662:veterinary; D012189:Retrospective Studies; D012509:Sarcoma / Q000662:veterinary; D013274:Stomach Neoplasms / Q000662:veterinary; D014463:Ultrasonography
keywords: canine; cecum; gastrointestinal stromal tumor; ultrasound