Benign neoplasms
Extremely rare. They include:
- Epithelial: adenoma.
- Mesenchymal: fibroma, lipoma.
Gallbladder carcinoma
The tumor develops from the mucosal epithelium. Most commonly localized in the fundus or neck of the gallbladder.
- Macroscopy: may present as papillary growths or diffuse wall thickening, which is visually indistinguishable from chronic inflammation.
- Invasion: the tumor rapidly infiltrates the wall and spreads to adjacent organs, primarily the liver.
- Histology: adenocarcinoma predominates. Squamous cell carcinoma, developing on the background of epithelial metaplasia, is less common.
Cholangiocarcinoma
A tumor of the ductal epithelium characterized by slow growth and a tendency to invade surrounding tissues. The main affected areas are the confluence of the hepatic ducts and the distal part of the common bile duct (ampulla of Vater).
Clinically manifests early as subhepatic jaundice, pain, and weight loss due to the strategic localization of the process.
Briefly: answers to topical questions
What are the pathways of metastasis in gallbladder cancer?
Gallbladder cancer metastasizes via lymphatic and hematogenous routes and is also characterized by local invasive growth.
The following pathways of spread are distinguished:
- Lymphatic metastasis — has an extensive regional character, affecting the lymph nodes.
- Hematogenous metastasis — spread of tumor cells via the bloodstream to other organs.
- Local and vascular invasion — direct tumor growth into the gallbladder wall, blood vessels, and adjacent organs (e.g., the liver).
What background and precancerous conditions are identified for gallbladder cancer?
Background and precancerous conditions for gallbladder cancer include chronic inflammatory processes, benign neoplasms, and hereditary disorders.
The following conditions are distinguished:
- Cholelithiasis — accompanied by chronic inflammation.
- Hyalinizing cholecystitis — includes focal or diffuse calcification («porcelain gallbladder»).
- Benign lesions — polyps greater than 1 cm in diameter, adenomas, and adenomatosis of the gallbladder.
- Inflammatory diseases — sclerosing cholangitis, chronic infections, and inflammatory bowel disease (ulcerative colitis).
- Hereditary disorders — hereditary nonpolyposis colorectal cancer.
Which genetic mutations are most characteristic of cholangiocarcinoma?
Cholangiocarcinoma (especially intrahepatic localization) is characterized by a number of activating genetic mutations and translocations.
The following genetic alterations are distinguished:
- KRAS gene mutations — detected in 23% of cases in the biliary type of intrahepatic cholangiocarcinoma and in only 1% of the cholangiolar type.
- NTRK and FGFR1-4 gene translocations — their determination is mandatory for prescribing molecularly targeted therapy.
- BRAF/RAS co-mutations — their presence significantly reduces the efficacy of targeted treatment (specifically anti-HER2 therapy).
Gallbladder — «silent killer» (masks as cholecystitis), Ducts — «yellow flag» (causes early jaundice).
Class and exam questions
Why is gallbladder cancer often diagnosed late?
The symptoms of the tumor are nonspecific and almost completely mimic chronic cholecystitis, which hinders early detection.
What is the association between ulcerative colitis and biliary tract tumors?
Ulcerative colitis is a significant risk factor: it increases the risk of ductal cancer tenfold and contributes to the development of gallbladder cancer at a younger age (under 40 years).
What morphological growth patterns are characteristic of ductal carcinoma?
The tumor may grow as a node, papillary growths, or diffusely infiltrate the duct wall.
What else to study on this topic
- Differential diagnosis of gallbladder cancer and chronic cholecystitis.
- Mechanisms of squamous metaplasia of the gallbladder epithelium.
- Features of metastasis in cancer of the ampulla of Vater.
- The impact of familial adenomatous polyposis on biliary tract oncogenesis.
Master the entire topic in the "Pathological Anatomy" course
This is a summary. The course covers everything tested in classes and exams.
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Other topics in the section "Diseases of the Liver, Biliary System, and Exocrine Pancreas"
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