Transabdominal ultrasonography is used increasingly for the evaluation
of gastrointestinal disorders in small animals, including neoplasms s
uch as lymphosarcoma, carcinoma, and smooth muscle tumors (leiomyoma,
leiomyosarcoma). An updated summary of the clinical studies currently
investigating the use of ultrasonography to detect and to characterize
gastrointestinal neoplasia is presented in this article.