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Head of pancreas

The head of the pancreas is the broadest portion of the gland, located within the C-shaped curve of the duodenum. It is the most clinically important part of the pancreas because it is the most frequent site of pancreatic carcinoma and is intimately related to the bile duct, pancreatic duct, and major vessels.

The head includes the uncinate process, which hooks posterior to the superior mesenteric vessels. It plays a vital role in exocrine secretion, ductal convergence, and is a landmark in pancreaticoduodenectomy (Whipple procedure).

Synonyms

  • Pancreatic head

  • Duodenal portion of pancreas

  • Head of the pancreas with uncinate process

Location and Relations

  • Anteriorly: Transverse colon, transverse mesocolon, loops of jejunum

  • Posteriorly: Inferior vena cava (IVC), right renal vein and artery, bile duct, aorta

  • Medially: Neck of pancreas and superior mesenteric vessels

  • Laterally: Duodenum (descending and horizontal parts surround the head)

  • Superiorly: Origin of superior mesenteric vessels and portal vein

  • Inferiorly: Third part of duodenum, jejunal loops

Function

  • Houses the main pancreatic duct (duct of Wirsung) as it traverses to join the common bile duct at the ampulla of Vater

  • Produces and secretes pancreatic enzymes (exocrine function) essential for digestion

  • Contains islets of Langerhans contributing to endocrine function (insulin, glucagon)

  • Provides anatomical stability at duodenal loop and maintains relationship with biliary system

Clinical Significance

  • Pancreatic head carcinoma: Most common location for pancreatic cancer; often causes painless jaundice due to bile duct obstruction

  • Pancreatitis: Inflammation may localize here, leading to duodenal compression or biliary obstruction

  • Uncinate process tumors: May encase superior mesenteric artery or vein → unresectable disease

  • Surgical landmark: Head is resected during Whipple procedure

  • Radiology relevance: Assessed in detail with CT/MRI for tumor staging and ductal anatomy

MRI Appearance

T1-weighted images:

  • Normal parenchyma: intermediate signal intensity (slightly higher than liver)

  • Tumors: appear as low-signal intensity masses

  • Fat planes: bright, help delineate the gland

T2-weighted images:

  • Normal pancreas: relatively low-to-intermediate signal

  • Pancreatic duct: appears bright as a linear tubular structure

  • Cysts/pseudocysts: bright; tumors may be mildly hyperintense compared to parenchyma

STIR (Short Tau Inversion Recovery):

  • Normal gland: low-to-intermediate signal

  • Pancreatitis or edema: bright hyperintensity

  • Fat suppressed, improving lesion conspicuity

T1 GRE Fat-Sat Pre-Contrast:

  • Normal parenchyma: homogeneous intermediate signal

  • Tumors: usually hypointense compared to normal tissue

T1 GRE Fat-Sat Post-Gadolinium:

  • Normal parenchyma: intense, homogeneous arterial-phase enhancement

  • Carcinoma: hypoenhancing mass relative to background pancreas

  • Pancreatitis: heterogeneous patchy enhancement; necrosis shows non-enhancing areas

  • Cysts: no enhancement; walls may enhance if inflamed

CT Appearance

Non-Contrast CT:

  • Normal pancreas: soft tissue density slightly higher than muscle

  • Tumors: ill-defined, hypoattenuating regions

  • Calcifications: may appear in chronic pancreatitis

Post-Contrast CT:

  • Normal gland: enhances brightly and homogeneously in arterial phase

  • Carcinoma: hypoattenuating mass, often causing bile duct and pancreatic duct dilatation ("double duct sign")

  • Pancreatitis: focal enlargement, heterogeneous enhancement, peripancreatic fat stranding

  • Cysts/abscesses: low-attenuation collections, with rim enhancement if infected

MRI image

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MRI image

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CT image

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CT image

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