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Summary: Background: Hot-snare polypectomy is a standard method for removal of polyps larger than 10 mm. It is recommended to discontinue anticoagulant therapy before this procedure to reduce a bleeding risk. In contrast, diagnostic colonoscopy and cold-snare polypectomy up to 10 mm are considered safe during uninterrupted anticoagulation therapy (with only omission of the direct oral anticoagulant therapy on the day of the procedure). The increasing number of anticoagulated individuals undergoing a colorectal cancer screening program leads to efforts to individualize the interruption of anticoagulation therapy. Aim: Estimation of probability that adenomatous polyp over 10 mm is detected during preventive colonoscopy in the Czech Republic in particular population groups according to gender and age. Methods: We retrospectively analyzed data from prospective database (Registry of Preventive Colonoscopies) covering screening colonoscopies and colonoscopies indicated for immunochemical faecal occult blood test positivity (FIT-positive). A distinction was made between adenoma polyps ≤10 mm and >10 mm. The patient was categorized according to the largest polyp diameter in case of detection of multiple polyps. Results: Between 2016 and 2020, 16,942 and 52,052 adenomatous polyps were found during 55,546 screenings and 119,229 FIT-positive colonoscopies, representing adenoma detection rate (ADR) of 31% and 44%, respectively. The estimate of probability of significant polyp detection (over 10 mm) and the need of hot-snare polypectomy ranged widely (2.3–21.6%) depending on age, sex and indication. It can be estimated to 7% in females and 5–10% in males undergoing screening colonoscopy. For colonoscopies indicated for positive stools for occult bleeding, this probability is approximately two to three times higher in FIT-positive colonoscopies: it exceeds 10% in woman over 60 years of age and is 15% and more in men of all ages (over 20% in men over 60 years of age). Conclusions: The decision to discontinue anticoagulation therapy prior to preventive colonoscopy can be individualized with respect to the indication (screening vs. FIT-positive), age and gender of examined person – we prefer to discontinue the anticoagulation therapy in FIT-positive people over 60 years and/or of male gender. The individual thromboembolic risk during interruption of anticoagulation therapy must be considered depending on the specific indication (e. g. CHA2DS2 VASc score in atrial fibrillation). Key words: colonoscopy – anticoagulant therapy – direct-acting oral anticoagulants – cancer screening – personalized medicine

Doporucene postupy Ceske gastroenterologicke spolecnosti k zavedeni perkutanni endoskopicke gastrostomie.

Familial adenomatous polyposis (FAP) is a hereditary disease characterized by presence of numerous colorectal adenomas. It often exposes its carrier to absolute risk of colorectal cancer, but also to other extracolonic tumours (especially to duodenal cancer and desmoid). Screening and surveillance of FAP patients leads to reduction of colorectal cancer incidence and mortality. Colonoscopy/lower endoscopy and esophagogastroduodenoscopy (including use of side-viewing endoscope) are the principal examinations. Colectomy is the standard therapeutic procedure, but endoscopic therapy plays relevant role both in upper and lower gastrointestinal tract. Recent international guidelines and some new tools for severity classification enable effectively reduce the mortality related to this disease by individualized patient management. Key words: colorectal cancer - familial adenomatous polyposis.

Pneumatosis cystoides is a rare gastrointestinal condition characterised by the presence of gas in the wall of the gastrointestinal tract, predominantly the small and large intestine. This phenomenon occurs in three forms: 1) primary pneumatosis cystoides, 2) a secondary form, which accompanies a wide range of gastrointestinal and systemic diseases, and 3) pneumatosis complicating intestinal ischaemia. The pathogenesis is not clearly known and is most likely multifactorial; hydrogen overproduction represents what is probably the most consistent theory of PCI formation. PCI is often an incidental finding during colonoscopy — endoscopic suspicion on PCI based on collapse during the puncture can be supported by the typical cytological findings. Computerised tomography is the most sensitive radiodiagnostic method, which can also detect possible underlying disease. Oxygen inhalation and antibiotics is the mainstay in conservative therapy, together with therapy of the underlying disease. Candidates for surgical and/or radiological intervention are mainly recruited from the third group of PCI accompanying abdominal catastrophe such as intestinal ischaemia.

Testing antilaminaribioside (ALCA) and antichitobioside (ACCA) antibodies in 89 Crohn's disease (CD), 31 ulcerative colitis (UC) and 50 controls, mean values were 38.6 and 53.0 ELISA units for CD, 34.0 and 32.6 for UC, 34.5 and 36.4 for controls, respectively. There was no significant difference of ALCA values between CD and UC (p = 0.401), CD and control subjects (p = 0.698) or UC and controls (p = 0.898). ACCA were significantly higher in CD compared with UC (p = 0.011) but not with the controls (p = 0.095). No significant difference of ACCA values between UC and controls (p = 0.107) was found. ALCA and ACCA values significantly correlated in CD (r = 0.548, p < 10 -4 ) and UC (r = 0.885, p < 10 -4 ) but not in controls (r = 0.153, p = 0.287). The positive predictive value for CD was only 20 (ALCA) and 8 % (ACCA), the negative ones (to exclude CD) 25 (ALCA) and 86 % (ACCA). Small and/or large bowel involvement or dis- ease type (i.e. stenosing, perforating or inflammatory) of CD did not differ in the two values. The idea that ALCA and ACCA may be useful either to differentiate between CD, UC and healthy subjects or to stratify CD was not confirmed.

Cronkhite-Canada syndrome is a rare disease characterised by diffuse polyposis of the gastrointestinal tract, diarrhoea, weight loss, abdominal pain, cutaneous hyperpigmentation, dystrophic changes of fingernails, and alopecia. The etiology is probably autoimmune and diagnosis is based on history, physical examination, endoscopic findings of gastrointestinal polyposis, and histology. The disease is very rare; about 450 cases have been described in the literature so far. We present a review of the literature with our own picture documentation of this rare condition.