Sestre Milosrdnice University hospital and Institute of Clinical Medical Research
Abstract
To date, there are no reliable endoscopic criteria to discriminate a diminutive (<5 mm) colorectal adenomatous from nonadenomatous polyps. Studies have demonstrated the usefulness of high-resolution chromoendoscopy (high-resolution colonoscopy with topically applied indigo carmine dye) in discrimination of adenomatous from nonadenomatous colorectal polyps. However, the clinical utility of standard videocolonoscopy and chromoscopy with indigo carmine dye in differentiating diminutive colorectal polyps has not yet been completely defined. The aim of this study was to determine whether a combination of standard videocolonoscopy and staining with indigo carmine dye could differentiate between adenomatous and nonadenomatous colorectal polyps smaller than 5 mm. Colonoscopy by use of an Olympus EVIS 140 video system was performed in 42 patients in whom colorectal polyps smaller than 5 mm were found. Polyps were sprayed with up to 40 ml of 0.5% indigo carmine dye, and polypectomy was performed, and the material was referred for histology. In 42 patients included in the study, 48 polyps sized <5 mm were detected. Histologic analysis showed 14 of them to be adenomatous and 34 nonadenomatous polyps. Endoscopist\u27s diagnosis was confirmed by histology in 12 of 14 (85.7%) adenomatous and 31 of 34 (91.2%) nonadenomatous colorectal diminutive polyps. The sensitivity, specificity, positive predictive value and negative predictive value of standard videochromocolonoscopy in distinguishing between adenomatous and nonadenomatous polyps sized <5 mm were 85.7%, 91.2%, 80% and 93.9%, respectively. The likelihood ratios (LR) were 0.157 (LR-) and 9.74 (LR+). In conclusion, standard videocolonoscopy combined with indigo carmine dye is a reliable method to differentiate adenomatous from nonadenomatous colorectal polyps sized <5 mm. Such a technique could limit the requests for unnecessary biopsies and repeat colonoscopy, thus significantly reducing the cost of colorectal cancer screening.Danas ne postoje pouzdani endoskopski kriteriji koji bi razlikovali sitne (<5 mm) kolorektalne adenomatozne od
neadenomatoznih polipa. Ranije su studije pokazale korisnu uporabu visoko-rezolucijske kromoendoskopije (visoko-rezolucijska kolonoskopija s topičkom primjenom indigo crvene boje) u razlikovanju adenomatoznih od neadenomatoznih kolorektalnih polipa. Ipak, klinička upotreba standardne video-kolonoskopije i kromoskopije s indigo crvenom bojom u razlikovanju sitnih kolorektalnih polipa nije još potpuno utvrđena. Namjera ovoga ispitivanja bila je utvrditi može li se kombinacijom standardne video-kolonoskopije i bojanja indigo crvenom bojom razlikovati adenomatozne od neadenomatoznih kolorektalnih polipa manjih od 5 mm. Kolonoskopija uz primjenu video sustava Olympus EVIS 140 izvedena je u 42 bolesnika u kojih su nađeni kolorektalni polipi manji od 5 mm. Polipi su poprskani 0,5%-tnom indigo crvenom bojom u količini do 40 mL, izvedena je polipektomija i provedena histološka analiza. U 42 bolesnika uključenih u ispitivanje nađeno je 48 polipa manjih od 5 mm. Histološka analiza pokazala je postojanje 14 adenomatoznih i 34 neadenomatoznih polipa. Endoskopist je ispravno predvidio histološki nalaz u 12 od 14 (85,7%) adenomatoznih, te u 31 od 34 (91,2%) neadenomatoznih kolorektalnih sitnih polipa.Osjetljivost, specifičnost, pozitivna prediktivna vrijednost i negativna prediktivna vrijednost standardne video-kromokolonoskopije u razlikovanju adenomatoznih od neadenomatoznih polipa manjih od 5 mm bile su 85,7%, 91,2%, 80%, odnosno 93,9%. Omjer vjerojatnosti (LR) iznosio je 0,157 (LR-) i 9,74 (LR+). Standardna video-kolonoskopija u kombinaciji s indigo crvenom bojom pouzdana je metoda za razlikovanje adenomatoznih od neadenomatoznih kolorektalnih polipa manjih od 5 mm. Ovakvom bi se tehnikom mogli smanjiti zahtjevi za nepotrebnim biopsijama i opetovanim kolonoskopijama, te tako značajno sniziti troškovi probiranja na kolorektalni karcinom
