Cholelithiasis

Classification and patient profile

The term cholelithiasis encompasses pathologies associated with the presence of stones in various parts of the biliary system. Depending on the exact anatomical localization of the concretions, three main forms of the disease are distinguished:

• Cholecystolithiasis — stones are located directly within the gallbladder lumen.
• Choledocholithiasis — concretions are located in the common bile duct (choledochus).
• Intrahepatic cholelithiasis — stones form in the intrahepatic bile ducts.

The development of the disease has a clearly defined risk factor profile. A typical patient with cholelithiasis is an elderly individual, more often female. Systemic lipid metabolism disorders play a huge role, particularly overweight status, which creates an unfavorable metabolic background for the normal functioning of the biliary tract.

Etiology and pathogenesis of lithogenesis

The process of stone formation (lithogenesis) is a multifactorial cascade triggered under specific conditions. It is based on three key groups of causes:

1. Metabolic disorders. Qualitative and quantitative changes in bile composition occur. Its colloidal stability decreases, creating an ideal environment for cholesterol precipitation.
2. Bile stasis. When bile passage is impaired, there is a significant increase in the concentration of its main components — cholesterol and bilirubin. The longer bile remains in the gallbladder, the higher the risk of crystallization.
3. The role of inflammation. The onset of an inflammatory process is accompanied by the release of specific exudate. This exudate exhibits a high content of protein fractions and salts (especially calcium ions). Such a change in the chemical balance of bile critically facilitates and accelerates the precipitation of bilirubin and cholesterol, forming a dense core of the future concretion.

Clinical manifestations

The clinical presentation of calculous cholecystitis is not uniform. The entire logic of symptoms and the severity of the patient's condition directly depend on where the stone is located and where it migrates:

• Localization in the neck of the gallbladder or cystic duct. If a stone begins to move into this area, the patient develops an acute pain attack — biliary colic. An important contributing factor in this case is concomitant biliary dyskinesia.
• Localization in the common bile duct (choledochus). This is a more dangerous situation, as the migration of the concretion into the choledochus carries the risk of its complete obstruction. The blockage of bile outflow inevitably leads to the development of obstructive jaundice syndrome.

Furthermore, the prolonged presence of a stone, mucosal trauma, and impaired outflow often lead to a secondary bacterial infection. In such cases, the process transforms into chronic calculous cholecystitis.

Principles of Diagnosis and Treatment

Diagnosis requires a comprehensive approach, starting with a thorough history taking. The physician should pay attention to the presence of recurrent biliary colic, especially in individuals predisposed to cholelithiasis (having prominent metabolic disorders).

Instrumental diagnostics:

• Abdominal ultrasound is the basic and primary method for identifying the problem.
• Radiological methods (including cholecystography and retrograde cholangiography) are used to clarify the diagnosis.
• The main goal of imaging is not just to detect the presence of concretions, but also to precisely determine the level of biliary tract obstruction.

Treatment approaches:

1. Surgical treatment. Gallbladder removal surgery (cholecystectomy) is recognized as the most effective method and is the universally accepted "gold standard" of treatment.
2. Conservative treatment. Medical dissolution of stones (litholysis) exists. However, this method entails the need for very prolonged administration of special drugs, and its actual clinical efficacy is still under investigation.

Briefly: answers to topical questions

Class and exam questions

What else to study on this topic

• Pathophysiology of biliary dyskinesia as a colic trigger
• Differential diagnosis of types of obstructive jaundice
• Technique and analysis of results of retrograde cholangiography
• Mechanisms of reduced colloidal stability of bile
• Transformation of acalculous cholecystitis into calculous cholecystitis upon infection

Other topics in the section "Liver, Biliary Tract, and Spleen"

Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.