Pancreatic Tail – Anatomy, Function and Diseases

What Is the Pancreatic Tail?

The pancreatic tail (Latin: Cauda pancreatis) is the narrow, left-sided terminal segment of the pancreas. The pancreas is anatomically divided into three main parts: the head (Caput pancreatis), the body (Corpus pancreatis), and the tail (Cauda pancreatis). The tail is the thinnest portion and extends toward the spleen, often making direct contact with it. It is located in the left upper abdomen, embedded within the splenorenal ligament.

Anatomy and Location

The pancreatic tail is situated retroperitoneally – that is, behind the peritoneum – in the left upper abdomen. It lies in close proximity to the spleen, the left kidney, and the left adrenal gland. This anatomical relationship is clinically important, as diseases of the pancreatic tail may involve or affect neighboring organs.

• Location: left upper abdomen, near the spleen
• Neighboring organs: spleen, left kidney, left adrenal gland, stomach
• Blood supply: via the splenic artery (Arteria lienalis) and its branches

Functions of the Pancreatic Tail

The pancreatic tail serves both exocrine and endocrine functions that are vital for the entire body.

Endocrine Function

The pancreatic tail contains a particularly high concentration of islets of Langerhans – clusters of hormone-producing cells. These cells produce essential hormones, including:

• Insulin (from beta cells): lowers blood glucose levels
• Glucagon (from alpha cells): raises blood glucose levels
• Somatostatin (from delta cells): regulates other hormones

Because the pancreatic tail is especially rich in islets of Langerhans, it plays a central role in blood sugar regulation. Diseases or surgical procedures involving the pancreatic tail may therefore impact insulin production and, in severe cases, lead to diabetes mellitus.

Exocrine Function

Like the rest of the pancreas, the tail also produces digestive enzymes that are delivered through the pancreatic duct into the small intestine. These enzymes are essential for the digestion of fats, proteins, and carbohydrates.

Diseases of the Pancreatic Tail

The pancreatic tail can be affected by various conditions. The most notable include:

Pancreatic Cancer (Pancreatic Carcinoma)

Approximately 10–15% of all pancreatic cancers originate in the tail. Because the tail is far from the bile ducts, tumors in this region do not typically cause jaundice – a common early sign of tumors in the pancreatic head. As a result, pancreatic tail cancer is often diagnosed late, when the tumor has already spread to neighboring organs or lymph nodes.

Pancreatitis (Pancreatic Inflammation)

In both acute and chronic pancreatitis, all parts of the pancreas – including the tail – can be affected. Inflammation may lead to pseudocysts, abscesses, or destruction of pancreatic tissue.

Pancreatic Cysts and Pseudocysts

Both benign and malignant cysts can develop in the pancreatic tail. Pseudocysts often form as a consequence of pancreatitis due to tissue damage.

Neuroendocrine Tumors

Because the tail is particularly rich in islets of Langerhans, neuroendocrine tumors of the pancreas (e.g., insulinomas, glucagonomas) frequently arise in this area.

Diagnosis of Pancreatic Tail Conditions

Various imaging methods are available to examine the pancreatic tail:

• Ultrasound (sonography): first-line investigation for suspected pancreatic disease; however, the tail can be harder to visualize than the head
• Computed tomography (CT): provides detailed images of the entire pancreas and surrounding structures
• Magnetic resonance imaging (MRI) / MRCP: particularly useful for visualizing the pancreatic duct and characterizing cysts
• Endoscopic ultrasound (EUS): ultrasound delivered via endoscope, allowing highly detailed views of the pancreas
• Blood tests: tumor markers (CA 19-9), pancreatic enzymes (lipase, amylase), blood glucose, and HbA1c

Treatment of Pancreatic Tail Conditions

Treatment depends on the underlying condition:

Surgical Intervention

The most common surgical procedure involving the pancreatic tail is the distal pancreatectomy – surgical removal of the pancreatic tail, often together with the spleen (splenectomy). This procedure is performed for malignant tumors, certain cysts, or severe injuries. In some cases, a spleen-preserving operation is possible.

Medical Therapy

Inflammation is managed with pain relief, dietary adjustments, and antibiotics when infection is present. Neuroendocrine tumors may be treated with specialized medications such as somatostatin analogues or targeted therapies.

Oncological Therapy

For pancreatic cancer in the tail region, treatment depends on the stage and may include surgery, chemotherapy, radiotherapy, or combination approaches.

References

1. Herold, G. et al. – Innere Medizin. Self-published, Cologne, 2023.
2. Beger, H. G. et al. – The Pancreas: An Integrated Textbook of Basic Science, Medicine, and Surgery. Wiley-Blackwell, 2008.
3. National Comprehensive Cancer Network (NCCN) – Clinical Practice Guidelines in Oncology: Pancreatic Adenocarcinoma. Version 2.2023. Available at: https://www.nccn.org