[Colonic polyps diagnosis by conventional video colonoscopes and chromoscopy with indigo carmine dye solution].
BACKGROUND
Magnification colonoscopy and contrast chromoscopy with indigo carmine dye solution have been used to differentiate neoplastic polyps (adenomas and adenocarcinomas) from non-neoplastic (hyperplastic, inflammatory, juvenile) in an attempt to obviate endoscopic polypectomy. On the other hand, little published information exists concerning conventional video colonoscopes and chromoscopy for polyp histology prediction. Aim - To assess usefullness of conventional video colonoscopes and contrast chromoscopy with indigo carmine solution for differential diagnosis of colon polyps.


METHODS
In a routine colonoscopy series, we performed chromoscopy with conventional video colonoscopes before endoscopic excision of detected polyps. If a sulcus pattern was observed on the surface of the lesion, it was classified as neoplastic. Polyps were classified as non-neoplastic if no sulcus was detected on its surface. These observations were then compared with histology.


RESULTS
In the study period (18 months), we detected 133 polyps in 53 patients. We were able to compare results of histology and chromoscopy in 126 lesions. The sensitivity, specificity, diagnostic accuracy, negative predictive value, and positive predictive value were 56,4%, 79,2%, 65,1%, 52,8%, and 81,5%, respectively.


CONCLUSIONS
On the base of the presented data, we concluded that conventional video colonoscopes and contrast chromoscopy with indigo carmine solution is not a good technique for differential diagnosis of colon polyps.
Nakao
Frank Shigueo
FS
Araújo
Isabella Saraiva
IS
Ornellas
Laura Cotta
LC
Cury
Marcelo de Sousa
Mde S
Ferrari
Angelo Paulo
AP
D000236:Adenoma / Q000473:pathology*; D018256:Adenomatous Polyps / Q000473:pathology; D000368:Aged; D003111:Colonic Polyps / Q000473:pathology*; D003113:Colonoscopy / Q000379:methods*; D004396:Coloring Agents; D005260:Female; D006801:Humans; D007203:Indigo Carmine; D008297:Male; D012680:Sensitivity and Specificity; D014741:Video Recording
D004396:Coloring Agents; D007203:Indigo Carmine