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HOME > J Yeungnam Med Sci > Volume 37(2); 2020 > Article
Original article
Comparison of small bowel findings using capsule endoscopy between Crohn’s disease and intestinal tuberculosis in Korea
Yong Gil Kim1orcid, Kyung-Jo Kim2orcid, Young-Ki Min3orcid
Yeungnam University Journal of Medicine 2020;37(2):98-105.
DOI: https://doi.org/10.12701/yujm.2019.00374
Published online: November 22, 2019

1Department of Internal Medicine, Soonchunhyang University College of Medicine, Gumi, Korea

2Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea

3Department of Physiology, Soonchunhyang University College of Medicine, Cheonan, Korea

Corresponding author: Young-Ki Min, Department of Physiology, Soonchunhyang University College of Medicine, 31 Suncheonhyang 6-gil, Dongnam-gu, Cheonan 31151, Korea Tel: +82-54-468-9086, Fax: +82-54-463-7504, E-mail: 71470@schmc.ac.kr
• Received: August 17, 2019   • Revised: October 19, 2019   • Accepted: November 5, 2019

Copyright © 2020 Yeungnam University College of Medicine

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • Background
    Little is known about capsule endoscopy (CE) findings in patients with intestinal tuberculosis who exhibit small bowel lesions. The aim of the present study was to distinguish between Crohn’s disease (CD) and intestinal tuberculosis based on CE findings.
  • Methods
    Findings from 55 patients, who underwent CE using PillCam SB CE (Given Imaging, Yoqneam, Israel) between February 2003 and June 2015, were retrospectively analyzed.
  • Results
    CE revealed small bowel lesions in 35 of the 55 patients: 19 with CD and 16 with intestinal tuberculosis. The median age at diagnosis for patients with CD was 26 years and 36 years for those with intestinal tuberculosis. On CE, three parameters, ≥10 ulcers, >3 involved segments and aphthous ulcers, were more common in patients with CD than in those intestinal tuberculosis. Cobblestoning was observed in five patients with CD and in none with intestinal tuberculosis. The authors hypothesized that a diagnosis of small bowel CD could be made when the number of parameters in CD patients was higher than that for intestinal tuberculosis. The authors calculated that the diagnosis of either CD or intestinal tuberculosis would have been made in 34 of the 35 patients (97%).
  • Conclusion
    The number of ulcers and involved segments, and the presence of aphthous ulcers, were significantly higher and more common, respectively, in patients with CD than in those with intestinal tuberculosis. Cobblestoning in the small bowel may highly favor a diagnosis of CD on CE.
Crohn’s disease (CD) and intestinal tuberculosis are chronic granulomatous diseases that can involve any part of the gastrointestinal tract but have a predilection for the terminal ileum and cecum [1]. Although intestinal tuberculosis has long been a common problem in developing countries, it has resurged in Western countries due to human immunodeficiency virus (HIV) infection and immigration from developing countries [2-4]. At the same time, the incidence of CD in areas endemic for intestinal tuberculosis has increased [5,6]. Thus, differentiation between the two diseases has become more important. Ileocolonoscopy is the primary diagnostic modality for both CD and intestinal tuberculosis [7], and colonoscopic findings differentiating intestinal tuberculosis from CD have been well described [8]. Small bowel lesions, however, are common in patients with CD. For example, in Korea, 21% of patients with CD were found to have small bowel disease [5]. Intestinal tuberculosis also primarily involves the distal ileum and cecum, followed by the small bowel [9].
Capsule endoscopy (CE), which can directly visualize the mucosa of the small bowel [10], is an effective modality for the diagnosis of CD undetected using conventional diagnostic techniques [11]. Less is known, however, about CE findings in patients with intestinal tuberculosis [12]. Misdiagnosing intestinal tuberculosis as CD may be harmful to patients in areas endemic for intestinal tuberculosis because CD is treated with intensive immunomodulator therapy and surgery. Therefore, we assessed the utility of CE in the differential diagnosis of CD and intestinal tuberculosis.
1. Ethics statement
The study protocol was approved by the Institutional Review Board of Asan Medical Center (IRB No: 2010-0894).
2. Patient selection
This was a retrospective study of information housed in the CE database of the Asan Medical Center (Seoul, Korea). CD was diagnosed based on conventional clinical, radiological, endoscopic, and histopathological criteria [6]. Between February 26, 2003 and June 12, 2015, 23 patients with CD underwent CE. Indications for CE included determination of the extent of small bowel disease in patients with established CD (n=19) and workup of suspected CD (n=4). The latter four patients were excluded because they were classified with probable CD based on clinical and histopathological criteria. Thus, only the 19 patients with established CD were enrolled [8,13].
During the same time period, 32 patients who underwent CE and diagnosed with intestinal tuberculosis, defined as meeting one of the following diagnostic criteria, were identified: histological evidence of caseating granulomas (n=14) on colonoscopic biopsy; histological demonstration of acid-fast bacilli (n=2) on colonoscopic biopsy; growth of Mycobacterium tuberculosis on tissue culture (n=8) of colonoscopic biopsy specimens; and colonoscopic evidence of intestinal tuberculosis and resolution after anti-tuberculous medication (n=8) [8,14]. CE for evaluation of the small bowel was performed in patients with confirmed intestinal tuberculosis immediately before starting anti-tuberculous medication. All patients provided written informed consent before the procedure. Patients taking nonsteroidal anti-inflammatory medications or aspirin were excluded.
3. Capsule endoscopy methods and imaging analysis
All patients ingested a polyethylene glycol electrolyte lavage solution for bowel preparation before CE, which was performed using the PillCam SB CE system (Given Imaging, Yoqneam, Israel). The CE parameters evaluated in this study included the number of ulcers, number of segments involved, aphthous ulcers, linear ulcers, a “cobblestone” appearance, focal lymphangiectasia, and stricture. The number of ulcers was dichotomized as ≥10 or <10. The presence or absence of lesions was assessed separately in four segments. The four segments were evenly divided throughout the entire small bowel passage time except the duodenum. If transient CE retention in the small bowel occurred, the delay time was not included in assessing the four segments. A stricture was defined as the presence of luminal narrowing that restricted passage of the capsule in the small bowel. Two endoscopists retrospectively reviewed all CE findings on a workstation and were blinded to the diagnoses. Discrepancies were resolved by consensus discussion after review.
4. Statistical analysis
Data are expressed as median and range, and were compared between the CD and intestinal tuberculosis groups using the Pearson chi-squared test or Fisher exact test; differences with p<0.05 were considered to be statistically significant. All statistical evaluations were performed using SPSS version 18.0 (SPSS Inc., Chicago, IL, USA).
1. Study population
A total of 55 patients were assessed: 23 with CD and 32 with intestinal tuberculosis. CE revealed small bowel involvement in 19 of 23 CD (83%) and 16 of 32 intestinal tuberculosis (50%) patients. Analysis of these 35 patients (19 with CD and 16 with intestinal tuberculosis), revealed a male-to-female ratio of 14:5 and 3:5, respectively. Median age at diagnosis was 26 years (range, 12–47 years) in patients with CD, and 36 years (range, 16–46 years) in those with intestinal tuberculosis. All patients were Asian, primarily Korean. Abdominal pain was the most common symptom in both groups, and there were no significant between-group differences in weight loss and the incidences of abdominal pain and diarrhea. The median duration between symptom onset and undergoing CE was 5.5 months (range, 1–36 months) in patients with CD, and 6 months (range, 2–12 months) in those with intestinal tuberculosis. There were also no significant differences in hemoglobin and C-reactive protein concentrations, and erythrocyte sedimentation rate. Patient characteristics are summarized in Table 1.
Among patients with CD, only 2 (10.5%) exhibited the stricturing type, the others were non-stricturing, non-penetrating type. The mean duration between symptom onset to diagnosis was 6.9±7.8 months. Among these, 11 patients (57.9%) had colonic lesions (L3) and 7 (36.8%) had concomitant perianal disease.
2. Capsule endoscopic findings
All 18 patients with CD had ≥10 ulcers in the small bowel, compared with only 2 of the 16 with intestinal tuberculosis (p<0.001). Moreover, all 17 CD patients had ulcers in >3 segments of the small bowel, compared with 1 of the 16 with intestinal tuberculosis (p<0.001). Aphthous ulcers in the small bowel were observed in all patients with CD and in 4 of 16 patients with intestinal tuberculosis (p<0.001) (Fig. 1). Linear ulcer of the small bowel was found in 10 of 19 with CD (52.6%) and in 4 of 16 with intestinal tuberculosis (25.0%) (Fig. 2). Cobblestoning was found in 5 of 19 CD (26.3%) and 0 of 16 intestinal tuberculosis patients (p<0.001) (Fig. 3), and strictures in 2 of 19 (10.5%) and 1 of 16 CD (6.3%) and intestinal tuberculosis patients, respectively (Fig. 4). CE findings in the two groups are summarized in Table 2. Overall, three parameters, ≥10 ulcers in the small bowel, involvement of >3 segments, and aphthous ulcers and cobblestoning, were significantly more common in patients with CD than in those with intestinal tuberculosis.
To our knowledge, this study is the first in Korea, to report CE findings that distinguished CD from intestinal tuberculosis. We found that CD was more commonly characterized by the presence of ≥10 ulcers, >3 involved segments, and aphthous ulcers. All of these criteria differed significantly between patients with CD and intestinal tuberculosis, and all were highly diagnostic.
CD and intestinal tuberculosis present with similar clinical manifestations, including weight loss, anemia, abdominal pain, and diarrhea [15]. We found that these clinical manifestations, including symptoms and laboratory findings, were similar in the two groups, although age at diagnosis was greater in patients with intestinal tuberculosis. Although colonoscopy can distinguish between ileocolic involvement in patients with intestinal tuberculosis and CD [6,13-15], one-fifth to one-third of patients with CD present with only small bowel involvement. Small bowel involvement is also common in patients with intestinal tuberculosis. In fact, we found that 50% of patients with intestinal tuberculosis exhibited small bowel involvement. Establishing a correct diagnosis is critical for choosing the appropriate therapy and for predicting prognosis, especially in areas in which intestinal tuberculosis is highly endemic. Although radiological examination, including small bowel follow-through, may be helpful in differential diagnosis, its diagnostic yield is not satisfactory.
Although CE may be useful in diagnosing CD in western countries [16,17], to date, there are no established criteria or guidelines for diagnosing CD. Studies have suggested that >3 or 10 small bowel ulcers are diagnostic for CD [16-18]. Those studies, however, involved patients in western countries, which have a low prevalence of intestinal tuberculosis. Distinguishing CD from intestinal tuberculosis, especially in areas highly endemic for tuberculosis, is more challenging.
In comparing CE findings in patients with established CD and intestinal tuberculosis, we assessed the number of ulcers, the number of segments involved, the presence of aphthous ulcers, linear ulcers, cobblestoning, focal lymphangiectasia, and strictures. However, we did not include ileocecal valve involvement because we believe that ileocecal valve involvement is a colonic or colonoscopic finding [19]. We found that CD involved more segments, with more ulcers and with aphthous ulcers, than intestinal tuberculosis. We did not detect cobblestoning in any of our patients with intestinal tuberculosis, and cobblestoning of the small bowel was highly significant in our study. Linear ulcers were more common in patients with CD than in those with intestinal tuberculosis; however, the difference was not significant. Cobblestoning and linear ulcer of the small bowel may not be specific to small bowel CD because both have been reported in patients with other conditions such as intestinal tuberculosis [8]. Larger-scale studies, however, may reveal significant differences in these two endoscopic findings.
The main concern in performing CE in these patients is capsule retention due to an unpredicted stricture in the small bowel. The leading cause of capsule retention is stricturing CD [20,21]. Capsule retention was more common in patients with confirmed CD than in those with suspected CD [22,23]. For predicting CE retention, two methods have been attempted: dedicated small bowel cross-sectional techniques; and patency capsules. However, cross-sectional techniques and patency capsules are both effective in decreasing the retention rate, although neither able to completely eliminate the risk for retention [24]. We found that passage of the capsule was delayed in 10% of CD patients and 12.5% of intestinal tuberculosis patients. Fortunately, all capsules passed spontaneously during follow-up without mechanical obstruction. Although capsule retention did not occur among our patients, physicians should be aware of the risk for capsule retention in patients with both intestinal tuberculosis and CD.
The main strength of the present study was the exclusion of patients with suspected CD (i.e., CE was performed only in patients with established CD or intestinal tuberculosis); as such, we avoided misclassification of CE findings. An important result of this study was our finding of potential diagnostic criteria distinguishing between CD and intestinal tuberculosis in tuberculosis endemic areas. In addition, we demonstrated that CE was diagnostically accurate in patients with these two diseases. Previous studies demonstrated that CE has a higher diagnostic yield for lesions associated with CD when compared with small bowel X-rays, ileocolonoscopy, computed tomographic enterography, push enteroscopy, or magnetic resonance imaging [11,16,23,25].
Some may argue that our study population was inappropriate for the comparison of CE findings because the male-to-female ratio, age at diagnosis, and extensive small bowel involvement in CD patients. Age at presentation can be a characteristic that differentiates CD from intestinal tuberculosis [26]. A male predominance in CD has been reported in Asian countries, including Japan, Hong Kong, and Korea [27,28]. Despite the relatively short duration between symptom onset to performing CE in patients with CD (5.5 months), compared with a western study (11 months) [29], our patients exhibited extensive lesions in their small bowel. Extensive small bowel lesions in CD patients with small bowel involvement are probably another characteristic of CD in Asians or, perhaps the use of CE enables the detection of previously undetected small bowel lesions [30].
This study had several limitations, including its retrospective design, which is prone to bias from unrecognized or unmeasured factors. However, we assessed CE results in patients with confirmed intestinal tuberculosis to avoid diagnostic misclassification. Second, our findings may not apply to HIV-infected patients because all of our subjects were HIV-negative. Third, our findings require validation in populations with different prevalences of CD and intestinal tuberculosis. Finally, we enrolled only CD patients who were not undergoing non-steroidal anti-inflammatory drug (NSAID) therapy. Thus, our diagnostic criteria cannot be applied to other ulcerative lesions such as NSAID-induced ulcers.
In conclusion, we found that three parameters―number of ulcers, number of involved segments, and the presence of aphthous ulcers―were significantly more common in patients with CD than in those with intestinal tuberculosis. Cobblestoning in the small bowel may highly favor a diagnosis of CD on CE. Our results should, nevertheless, be confirmed in a larger, prospective study.

Conflicts of interest

No potential conflict of interest relevant to this article was reported.

Fig. 1.
Capsule endoscopy reveals multiple aphthous ulcers (arrows) in patients with Crohn’s disease (A) and intestinal tuberculosis (B).
yujm-2019-00374f1.jpg
Fig. 2.
Capsule endoscopy reveals linear ulcers (arrow) in patients with Crohn’s disease (A) and intestinal tuberculosis (B).
yujm-2019-00374f2.jpg
Fig. 3.
Capsule endoscopy reveals cobblestone features in patients with Crohn’s disease.
yujm-2019-00374f3.jpg
Fig. 4.
Capsule endoscopy reveals strictures in patients with Crohn’s disease (A) and intestinal tuberculosis (B).
yujm-2019-00374f4.jpg
Table 1.
Clinical characteristics of patients
Characteristic Crohn’s disease (n=19) Intestinal tuberculosis (n=16) p-value
Age, yr (median, range) 26 (12–47) 36 (16–46) NA
Symptom to diagnosis (median, range) 6 (1–36) 6 (2–12) NA
Sex (male:female) 14:5 3:5 NS
Symptom
 Weight loss 14 7 NS
 Abdominal pain 17 9 NS
 Diarrhea 7 0 0.009
Laboratory abnormality
 Hemoglobin (g/dL) 12.6 12.4 NA
 Erythrocyte sedimentation rate (mm/hr) 30 24 NA
 C-reactive protein (mg/dL) 1.86 0.83 NA

NA, not available; NS, non-specific.

Table 2.
Comparison of capsule endoscopic findings between Crohn’s disease and intestinal tuberculosis
Variable Crohn’s disease (n=19) Intestinal tuberculosis (n=16) p-value
Numbers of ulcer <0.001
 ≥10 18 (94.7) 2 (12.5)
 <10 1 (5.3) 14 (87.5)
Numbers of involved segment
 1 0 13
 2 2 2
 3 4 1
 4 13 0
Numbers of more than half of involved segment <0.001
 ≥3 17 (89.5) 1 (6.3)
 <3 2 (10.5) 15 (93.7)
Upper gastrointestinal lesion 4 (21.1) 4 (25.0) NS
Aphthous ulcer 19 (100) 4 (25.0) <0.001
Linear ulcer 10 (52.6) 4 (25.0) NS
Cobblestoning 5 (26.3) 0 0.027
Focal lymphangiectasia 6 (31.6) 1 (6.3) NS
Stricture 2 (10.5) 1 (6.3) NS

Values are presented as number (%).

NS, non-specific.

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References

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