Clinical picture and basic echoscopy
Involvement of the pancreas in the pathological process is naturally accompanied by the development of abdominal and gastrointestinal manifestations (frequent GI involvement). Patients complain of pronounced pain localized in the epigastric region and hypochondria, typically radiating to the back.
During a standard ultrasound examination (B-mode), the physician visualizes edema and direct diffuse changes in the parenchyma. It is important to remember that increased echogenicity of the pancreatic tissue is merely a non-specific sign. In addition, ultrasound may reveal small calcifications within the organ tissue itself and dilation (pathological widening) of the pancreatic duct. At the same time, a clean ultrasound picture without visible stones does not exclude the possibility that calculi are still present in the gland.
Advanced ultrasound diagnostics
For more precise verification of structural changes, contrast-enhanced ultrasound (Contrast-enhanced ultrasound, CEUS) is used. This method allows for a detailed assessment of the organ's vascularization pattern.
During the examination, a homogeneous—that is, completely uniform—enhancement of the contrast agent by the tissues will be determined. The main clinical value of this modern technique is that it allows for the reliable exclusion of a malignant neoplasm that could obstruct the duct (duct-obstructing tumour).
The role of computed tomography (CT)
Computed tomography provides a detailed spatial representation of structural remodeling in chronic pancreatitis and allows for the precise visualization of calculi and complications.
- Standard axial view: reveals segmental calcification, which in most cases is localized in the body of the gland. Marked atrophy of the pancreatic tail is also highly characteristic. The combination of these two signs (calcifications and atrophy) has the highest diagnostic value: it strongly indicates the formation of a stricture or the presence of an intraductal calculus (intraductal calculus).
- Curved planar reformation: this special mode (Curved planar reformation) is essential for improved visualization of the entire ductal system of the organ. It demonstrates multiple intraductal calculi with maximum clarity.
- Evaluation of complicated course: CT excellently visualizes calculi causing complete obstruction. Massive dilation of the pancreatic duct forms proximal to the site of obstruction (upstream). Another frequent complication of chronic pancreatitis is splenic vein thrombosis (thrombosis of the splenic vein). On tomograms, it is accompanied by the compensatory formation of an extensive and branching network of venous collaterals.
Magnetic resonance cholangiopancreatography (MRCP)
MRCP (MRCP) is the method of choice for the most detailed assessment of the ductal system without radiation exposure.
Key diagnostic findings upon examination include:
- Visualization of strictures (pathological narrowings), which are most frequently located in the body of the pancreas.
- Pronounced dilation of the main pancreatic duct, as well as widening of its side branches proximal to the identified narrowing (upstream).
Clinical rule (Red Flag): If the diagnostic physician detects a duct stricture during the examination, it is critically important to fully and reliably rule out the presence of a malignant tumor directly in the area of narrowing.
CAT: Calcifications + Atrophy = look for a calculus or duct stricture. This helps to quickly interpret the CT picture in the standard axial view.
Class and exam questions
Are diffuse changes on ultrasound sufficient for a diagnosis of chronic pancreatitis?
No, an isolated ultrasound conclusion of diffuse changes is not a basis for establishing this diagnosis. A comprehensive evaluation of the clinical picture and other diagnostic imaging methods is required.
If stones are not visible on ultrasound, does that mean they are not there?
No, a negative result on a standard ultrasound does not rule out the presence of calculi in the pancreas.
What is contrast-enhanced ultrasound (CEUS) used for in pancreatic pathology?
The method demonstrates homogeneous contrast enhancement and is used primarily to reliably rule out a tumor obstructing the pancreatic duct.
What vascular complication is characteristic of chronic pancreatitis?
Splenic vein thrombosis (thrombosis of the splenic vein). In this case, CT visualizes the development of an extensive network of venous collaterals.
What else to study on this topic
- Pathophysiology of intraductal calculus formation
- Differential diagnosis of benign strictures and tumors
- Mechanisms of splenic vein thrombosis development
- Features of curved planar reformation in CT
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