Insulinoma, a small and malignant neuroendocrine tumor of dogs, has proven difficult to detect reliably with imaging tests. The literature suggests that ultrasound detects a primary pancreatic lesion in approximately 50% of cases and detects metastases in only 20% of cases. CT has a reported success rate of detecting a primary lesion in 70% of cases, but is of limited value in the detection of metastases. Continue reading
Portal Vein Thrombosis, In Depth
Portal vein thrombosis is being recognized with increased frequency in small animals due to greater awareness of hypercoagulable states and greater use of abdominal ultrasound in animals with gastrointestinal signs. The veins of the hepatic portal system drain the digestive organs, spleen and pancreas and deliver blood to the liver via the hepatic portal vein. The portal vein is responsible for delivering close to 75 percent of the hepatic blood supply, the remaining being provided by hepatic arteries. Obstruction of the portal vein occurs most commonly secondary to thrombus formation, or due to neoplastic infiltration and secondary thrombus formation.
A predisposing cause for hypercoagulability is identified Continue reading