Canine Insulinoma Study Guide

Overview and Clinical Importance

Insulinomas are the most common endocrine tumors of the canine pancreas, arising from the beta cells of the islets of Langerhans. These functional neuroendocrine tumors inappropriately secrete excessive insulin, leading to profound and potentially life-threatening hypoglycemia. Understanding insulinomas is critical for the NAVLE as they represent an important intersection of endocrinology, oncology, and emergency medicine.

Unlike human insulinomas, which are benign in approximately 90% of cases, canine insulinomas are malignant in greater than 95% of cases and frequently metastasize to regional lymph nodes and the liver. Approximately 45-55% of dogs have metastatic disease at the time of diagnosis, making early detection and appropriate staging crucial for treatment planning and prognosis.

Signalment and Epidemiology

Breed Predisposition

While any breed can be affected, large and medium-sized breeds are overrepresented. Commonly affected breeds include German Shepherds, Irish Setters, Boxers, Golden Retrievers, Labrador Retrievers, Standard Poodles, and various terrier breeds. Recent reports also document insulinomas in smaller breeds including West Highland White Terriers, Chihuahuas, Yorkshire Terriers, and French Bulldogs.