Medically reviewed by Edward Tavel, MD, Medical Director · Last reviewed 23 August 2026
Endocrine pancreatic tumors, also known as pancreatic neuroendocrine tumors (PNETs), develop in the hormone-producing cells of the pancreas. Unlike the more aggressive ductal adenocarcinoma, these tumors often grow slowly and may behave very differently depending on whether they produce hormones. Some remain small and cause no symptoms, while others release excess hormones that disrupt normal body function. Their variability makes them challenging to recognize without imaging.
PNETs make up only a small percentage of pancreatic cancers, but their impact can be significant, especially when they grow silently for years. Because they may not interfere with digestion, they often go unnoticed until a scan is done for another reason—or until symptoms become difficult to ignore.
What Causes It?
In many individuals, these tumors develop sporadically, with no identifiable cause. However, certain inherited genetic conditions increase risk, including Multiple Endocrine Neoplasia type 1 (MEN1), Von Hippel–Lindau disease, and neurofibromatosis. Some studies have also linked PNETs to long-standing inflammation of the pancreas or metabolic changes over time. Even with these insights, most cases remain unexplained, making proactive monitoring important for higher-risk patients.
Symptoms
Symptoms depend on whether the tumor is “functional” (produces hormones) or “nonfunctional” (does not produce hormones).
Functional tumors may cause symptoms related to hormone excess, such as episodes of sweating, shakiness, severe fatigue, abdominal pain, sudden blood sugar changes, or unexplained gastrointestinal symptoms.
Nonfunctional tumors often remain silent and may grow to a significant size before causing issues, such as vague abdominal pain, early satiety, back pain, changes in bowel habits, or unintentional weight loss.
Because these symptoms are nonspecific, they are often attributed to stress, diet, or other common medical conditions.
How Whole-Body MRI Helps
Whole-body MRI provides a detailed, radiation-free view of the pancreas and can identify both functional and nonfunctional neuroendocrine tumors. MRI is especially helpful in revealing small lesions, cystic changes, and subtle tissue differences that may not be visible on standard imaging. In patients with genetic risk factors or a family history of PNETs, periodic MRI screening can highlight interval changes before symptoms develop.
MRI also evaluates surrounding organs and lymph nodes, helping physicians understand whether a tumor has spread and aiding in treatment planning.
What to Do Next
If you have a family history of endocrine tumors, unexplained hormonal symptoms, sudden blood sugar fluctuations, or persistent abdominal discomfort, discuss these concerns with your physician. A whole-body MRI at MRI Wellness offers a safe, non-invasive way to identify abnormalities across all organ systems—including rare or hard-to-detect pancreatic tumors.
Frequently asked questions
How are PNETs different from pancreatic ductal adenocarcinoma?
PNETs develop in the hormone-producing cells of the pancreas rather than in the ducts. They often grow slowly and behave very differently from the more aggressive ductal adenocarcinoma.
Are neuroendocrine tumors always cancerous?
No. Many PNETs are benign or slow-growing. However, some can become malignant over time, especially nonfunctional tumors that grow silently without causing hormone-related symptoms.
What does it mean if a tumour is functional?
A functional tumour releases excess hormones that disrupt normal body function and can produce noticeable symptoms. A non-functional one may stay quiet and be found only when a scan is done for another reason.
Why do some neuroendocrine tumors cause hormonal symptoms?
Functional PNETs produce excess hormones such as insulin, gastrin, or glucagon. When these hormones circulate at high levels, they can trigger symptoms like low blood sugar, stomach ulcers, or unexplained weight loss.
What causes them?
In many individuals these tumours develop sporadically, with no identifiable cause. Certain inherited conditions raise risk, including Multiple Endocrine Neoplasia type 1, Von Hippel-Lindau disease and neurofibromatosis.
How are they usually found?
Often incidentally, on a scan performed for another reason. Because they may not interfere with digestion, they can go unnoticed until symptoms become difficult to ignore.
If anything in your own report is unclear, that is best discussed directly. Call MRI Wellness at 1-833-WELLMRI and we can help you understand what it describes and arrange a review if that is needed.
Sources
A whole-body MRI at MRI Wellness looks at the brain, spine, chest, abdomen and pelvis in a single session, without radiation or contrast dye. No referral is needed.
