28 topics with concise breakdowns: definitions, key facts, and class questions.
This section covers morphological changes throughout the entire gastrointestinal tract. We examine inflammatory, destructive, and neoplastic processes that underlie the clinical presentation of digestive system pathologies.
Material is grouped by organ. Starting with tonsillitis and esophageal pathologies (esophagitis, Barrett's esophagus, cancer), we move on to the stomach: detailing types of gastritis (including the role of Helicobacter pylori), symptomatic ulcers, the pathological anatomy of peptic ulcer disease, and gastric cancer with its metastasis pathways. The intestinal section covers inflammatory bowel diseases (ulcerative colitis, Crohn's disease, appendicitis), duodenitis, celiac disease, diverticular disease, acute intestinal obstruction, as well as colorectal cancer and anal canal diseases, including hemorrhoids.
In practical classes and exams, the pathological anatomy of peptic ulcer disease, the differential diagnosis of Crohn's disease and ulcerative colitis, as well as the macro- and microscopy of appendicitis forms are tested most rigorously. Pay special attention to precancerous conditions of the stomach and intestines—this is an absolute foundation that every physician must know.
How does follicular tonsillitis visually differ from lacunar tonsillitis?
In the follicular form, suppurated follicles shine through the mucosa as millet-seed-sized yellowish grains. In lacunar tonsillitis, yellowish masses of exudate accumulate directly in the folds (lacunae) of the tonsils.
How to differentiate congenital short esophagus and Barrett's esophagus?
In a short esophagus, the Z-line is displaced proximally due to a true anatomical anomaly. In Barrett's esophagus, the boundary shift is caused by pathological gastric or intestinal metaplasia of the mucosa.
Which inflammatory infiltrate is most specific for reflux esophagitis?
Eosinophilic infiltration. It is considered one of the earliest and most reliable signs, unlike neutrophilic infiltration, which can be a distant reaction to any necrosis.
What are the main endoscopic and histological signs of Barrett's esophagus?
Endoscopically, red foci in the form of flame-like tongues extending proximally from the Z-line by 3 cm or more are determined. Histologically, intestinal metaplasia with the mandatory presence of goblet cells is revealed.
What factors provoke the development of esophageal adenocarcinoma?
The primary cause is gastrointestinal reflux. The mucosa is damaged by bile acids, low pH (acid), pepsin, and nitric oxide, which triggers a cascade of changes from inflammation to cancer.
Where exactly is Helicobacter pylori localized in the stomach?
The bacterium inhabits the supraepithelial mucus layer, where it is protected from the direct action of the aggressive acidic environment of the gastric lumen.
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