Canine Insulinoma: NAVLE Study Guide

Canine insulinoma is one of those conditions the NAVLE loves to test because it hits multiple systems at once — endocrine, neuro, emergency medicine, surgery. The presentation is dramatic, the diagnosis has a specific algorithm, and the management decisions are high-stakes. Get the logic down and this becomes a reliable point-getter.

What You're Dealing With

Insulinomas arise from the beta cells of the islets of Langerhans in the pancreas. They're functional — meaning they secrete insulin. The problem is they keep secreting it even when blood glucose falls, because the normal negative feedback loop is broken. Neoplastic beta cells don't respond to hypoglycemia the way normal beta cells do.

The result is progressive, inappropriate hyperinsulinemia driving profound hypoglycemia. The brain, an obligate glucose consumer with minimal glycogen reserves, takes the hit hardest.