Ultrasonographic findings in 42 horses with cecal lymphadenopathy.

Mesenteric lymphadenopathy is commonly found on postmortem examination in horses with infectious, inflammatory, or neoplastic disease but has been rarely reported as an ultrasound finding. Mesenteric lymph nodes are not often visualized by ultrasound because of their location deep within the abdomen. The cecal mesentery, however, is located adjacent to the body wall in the right flank region and can be readily visualized in most horses. The purpose of this study is to describe ultrasonographic findings associated with cecal lymphadenopathy with clinical diagnosis and outcome.