RESULTS: One hundred and thirty-three colorectal polyps from 119 patients were studied. The mean diameter, by post-polypectomy measurement, was 0.92 ± 0.69 cm; 83 were < 1 cm, 36 were between 1 and 2 cm, and 14 were > 2 cm. The mean diameter, by visual estimation, was 1.15 ± 0.88 cm; compared to the actual size measured using vernier calipers, the difference was statistically significant. The mean diameter measured using the DGBF was 0.93 ± 0.68 cm; compared to the actual size measured using vernier calipers, this difference was not statistically significant. The ratio between the mean size estimated by visual estimation and the actual size was significantly different from that between the mean size estimated using the DGBF and the actual size (1.26 ± 0.30 vs 1.02 ± 0.11).
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METHODS: Gradations accurate to 1 mm were assessed with the wire of disposable graduated biopsy forceps. When a polyp was noted, endoscopists determined the width of the polyp; then, the graduated biopsy forceps was inserted and the largest diameter of the tumor was measured. After excision, during surgery or endoscopy, the polyp was measured using the vernier caliper.
Core tip: In this study, we designed a disposable graduated biopsy forceps and used the forceps as &#;scale plate&#; to measure the polyp size. We enrolled 133 polyps from 119 patients and found that the accuracy of the visual estimation for a polyp size was low but could be improved if the disposable graduated biopsy forceps were used as a scale. Though some slight deviation still existed for estimation of polyps over 2 cm, the difference was not significant and did not affect treatment.
Many endoscopists evaluate the size of a polyp based on their personal experience, which may be inconsistent with the actual size of the colon tumor. Eichenseer et al[ 8 ] compared the estimated size of 10 to 25-mm polyps, as determined during endoscopy, with the size determined by post-fixation histopathology of the polyps by 15 different endoscopists; they found that the mean size variation between the polyp size estimation at endoscopy and the size determined by histopathology of the polyps was 73.6% (range of mean size variation, 13%-127%). In addition, 62.6% (range, 0%-91%) included polyps that were clinically sized incorrectly; overestimation of the polyp size, during endoscopy, was more common than underestimation. Furthermore, some endoscopists inaccurately estimated the size of adenomas, and this led to inappropriate surveillance recommendations. In order to evaluate the differences between the size estimated by endoscopists and the actual size, as determined by histopathology, we developed a system using disposable graduated biopsy forceps to evaluate the size of colon polyps and compared this to both the estimation reported by endoscopists and the final size determined by histopathology.
The size of a tumor, detected at colonoscopy, is associated with the subsequent management of patients. If the size of a colon polyp is less than 3 cm, endoscopic mucosal resection (EMR) or endoscopic submucosal dissection (ESD) could achieve complete resection with few complications[ 1 , 2 ]. If a colon polyp is greater than 3 cm, the bowel would need to be resected by endoscopic resection; these cases have been associated with a high risk of complications. However, for colon polyps less than 3 cm, the methods used and risks associated with endoscopic resection are different; that is, for polyps 2-3, 1-2 cm and those less than 1 cm[ 3 , 4 ]. Several clinical guidelines include the size and extent of the tumor as an important factor for deciding on the use of endoscopy for resection of colon polyps. Therefore, accurate measurement of colon polyps, during colonoscopy, is crucial for the appropriate management of patients with colon polyps[ 5 - 7 ]. However, there are no standard criteria for measuring the size of a colon polyp during colonoscopy.
Data were analyzed using SPSS 17.0 software for Windows. The paired Student&#;s t-test was used to compare the ratio of the estimated size, by the endoscopists, to the actual size measured using the vernier caliper, with the ratio of the size measured using the graduated biopsy forceps to the actual size measured using the vernier caliper. Analysis of variance was used to compare the differences among the three groups. A P-value < 0.05 was considered statistically significant.
The graduated biopsy forceps was developed based on the traditional disposable biopsy forceps. At the beginning of the steel wire of the traditional disposable biopsy forceps, gradations were drawn every 1 mm along a 3-cm total length, using medical pigment. This was used as a scale plate for estimating the size of the tumors. From April to September , patients with polyps were enrolled from the National Center of Colorectal Surgery, Nanjing University of Traditional Chinese Medicine. First, when the endoscopists discovered a polyp or tumor, they assessed the largest diameter of the tumor; then, they inserted a graduated biopsy forceps and measured the largest diameter of the tumor from the vertical view; lastly, the &#;gold standard&#; for the largest diameter of the tumor was accurately measured using a vernier caliper, after excising the tumor by surgery or endoscopy (Figure ). A correct measurement was defined as a variation of less than 10% between the size evaluated and the actual size as measured using a vernier caliper. The accuracy rate was defined as the number of polyps accurately evaluated divided by the total number of polyps. Five endoscopists who had an experience of over cases of colonoscopy were involved in the study.
For polyps that were > 2 cm, the mean largest diameter measured using the vernier caliper was 2.70 ± 0.58 cm, while the mean largest diameter evaluated by the endoscopists was 3.12 ± 0.91 cm (range, 2.0-5.0 cm); this difference was statistically significant (P = 0.006), which implied that the endoscopists tend to overestimate the polyp size. The mean largest diameter measured using the graduated biopsy forceps was 2.64 ± 0.59 cm; this was not significantly different from the mean largest diameter measured using the vernier caliper (P = 0.223).
For polyps 1 to 2 cm, the mean largest diameter measured using the vernier caliper was 1.31 ± 0.34 cm, while the mean largest diameter by the endoscopists was 1.77 ± 0.71 cm (range, 0.6-3.0 cm); the difference was statistically significant (P = 0.000). The mean largest diameter measured using the graduated biopsy forceps was 1.323 ± 0.43 cm (range, 0.9-2.1 cm); this was not significantly different from the mean largest diameter measured using the vernier caliper (P = 0.688).
For those polyps < 1 cm, the mean largest diameter evaluated by the endoscopists was 0.70 ± 0.23 cm (range, 0.2-1.5 cm); this was significantly different from the actual size measured using the vernier caliper (0.57 ± 0.17 cm) (P = 0.000). The mean largest diameter measured using the graduated biopsy forceps was 0.58 ± 0.17 cm; this was not significantly different from the actual size as measured using the vernier caliper (P = 0.096).
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One hundred and thirty-three colon polyps from 119 patients (76 males and 43 females; average age, 58.29 ± 11.45 years; range, 28-82 years) were included. Among the polyps, 40 were rectal polyps, 43 sigmoid colon polyps, seven descending colon polyps, 12 transverse colon polyps, and 31 cecum or ascending colon polyps. Among the patients, two underwent laparoscopic colectomy, and all others had endoscopic mucosal resection. One hundred and seven were adenomas, while four were villous adenomas (of which, one was mucosal cancer, two were tubulovillous adenomas and one was a neuroendocrine tumor, a carcinoid tumor).
The size of a colon polyp, assessed at colonoscopy, is crucial for determining patient management. Many clinical guidelines use the size and extent of the tumor as an important factor for determining whether to resect colon polyps using endoscopy[5-7]. However, accurate estimation of the size of a polyp, during colonoscopy, is not guaranteed. Currently, the size of a polyp is evaluated by endoscopists based on their personal experience; however, there is great variation among endoscopists with regard to the evaluated size and actual size of a colon polyp. In some studies, the oncological potential of a colon polyp has been related to its size and shape, indicating that the measurement of the colon polyp size was an important factor for determination of the risk associated with the colon polyp[9,10]. In this study, the difference between the actual size of the colon polyp and the size assessed by the endoscopists was significant. The actual size measured using the vernier caliper varied from the size estimated by the endoscopists, and this difference was statistically significant, especially for polyps greater than 1 cm. The reason for the variation in size estimation via endoscopy was the absence of a &#;scale plate&#;. All size estimations were done based on the endoscopists&#; experience. Those endoscopists who were more experienced could accurately evaluate the size of the colon polyps; however, the size estimated by those endoscopists who were less experienced varied from the actual size. The accuracy of size estimation was improved by using the graduated biopsy forceps during endoscopy[11]. Morales et al[12] used an open biopsy forceps as a guide to measuring the colon polyp size during colonoscopy; however, there were significant differences between the endoscopic estimates and the post-polypectomy measurements for three-quarters of the polyps. Gopalswamy et al[13] compared the accuracy of a linear probe, visual estimation and forceps for estimating polyp size during colonoscopy; they found that the measurement of the polyp size using a linear probe had the best agreement with the actual polyp size, followed closely by visual estimation. The open biopsy forceps method was the least accurate. However, the linear probe requires special software to estimate size, which adds to the examination time and cost of the procedure. In recent years, the computed tomography (CT) colonoscopy has been used to estimate the size of colon polyps with a high degree of accuracy. However, the patients required bowel preparation before a CT colonoscopy and the procedure was very costly[14-16].
To estimate the size of colon polyps, we developed a graduated biopsy forceps based on the traditional disposable biopsy forceps. Gradations were drawn every 1 mm along the 3-cm total length using medical pigment. The accuracy of estimating the size of the colon polyps increased when using the graduated biopsy forceps. In this study, the mean estimated size, by the endoscopists, was 1.15 cm; this was different from the actual size measured using the vernier caliper (0.92 cm) and the difference was statistically significant. However, the mean size measured using the graduated biopsy forceps was 1.02 cm, which was statistically similar to the actual size measured using the vernier caliper (0.93 cm). Therefore, the size measured using the graduated biopsy forceps was consistent with the actual size as measured using the vernier caliper. The ratio of the size estimated by the endoscopists to the actual size measured using the vernier caliper was 1.26, while the ratio of the size measured using the graduated biopsy forceps to the actual size measured using the vernier caliper was 1.02; the difference between these two ratios was statistically significant (P = 0.000). These findings show that the graduated biopsy forceps could improve the accuracy of size estimation of colon polyps.
Different polyp sizes affected the accuracy of size estimation. The bigger the tumor size was, the less accurately the tumor was estimated. From our study, the polyp size by endoscopist tends to be overestimated, and the polyp size tends to be more accurately estimated when we used the graduated biopsy forceps. For polyps less than 1 cm, 86.7% could be accurately measured. For polyps between 1 and 2 cm, only 11.1% could be accurately estimated by the endoscopists, while 66.7% were accurately measured using the graduated biopsy forceps. These findings indicate that using the graduated biopsy forceps improved the accuracy of size estimation and decreased the variation of measurements.
However, this type of graduated biopsy forceps could only measure polyps along the longitudinal axis of the bowel; polyps that surrounded the enteric cavity could not be directly measured with the graduated biopsy forceps. In such cases, estimations by the endoscopists were needed; they identified polyps that surrounded the enteric cavity. In this study, for 14 polyps that were > 2 cm, variation existed in 42.9% (6/14) of the polyps, especially for the lateral spread of the polyps. The size measurement could not be determined in one view, and in such cases the assessment might be different from the actual size.
In conclusion, the estimation of colon polyp size during endoscopy based on endoscopists&#; experience had lower accuracy; use of the graduated biopsy forceps during endoscopy improved the accuracy of size estimation. Although there were variations in laterally spreading colon polyps that were > 2 cm, the variations were significantly decreased and they did not affect treatment and follow-up.
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