A 24-year-old woman with a presumed diagnosis of irritable bowel syndrome (with normal
serum inflammatory markers, ileocolonoscopy, and small-bowel barium study) underwent
video capsule endoscopy. This revealed a tight, inflamed, and ulcerated ileal stricture,
which the capsule did not seem to pass through ([Video 1]
[2]). An abdominal radiograph 18 hours later showed the capsule in the lower pelvis,
and there were no signs of obstruction, suggesting that the capsule had passed into
the distal colon ([Fig. 1]).
Fig. 1 A plain abdominal radiograph showing the capsule in the lower pelvis (arrow). There
were no signs of obstruction, suggesting that the capsule had passed into the distal
colon.
Video
1, 2 Wireless capsule endoscopy revealed a tight, inflamed, and ulcerated stricture, which
the capsule did not appear to pass through, appearances in keeping with a diagnosis
of Crohn’s disease.
The patient developed worsening abdominal pain and abdominopelvic computed tomography
revealed severe ileal disease with an inflammatory mass and the retained capsule ([Fig. 2]). At laparotomy a large, indurated ileocecal mass with fistulation into the rectum
was found, in keeping with Crohn’s disease. The capsule was located in the fistula,
not within the intestinal lumen. There was an ileal stricture (10 cm in length, 30 cm
proximal to the ileocecal valve) which the capsule had passed through. An ileocecal
resection with a double-barrelled stoma was performed.
Fig. 2 Abdominopelvic computed tomography revealed a pelvic inflammatory mass (A). The retained
capsule was identified (arrow), and there was severe ileal disease with wall thickening
(arrowhead).
Capsule retention due to small-bowel lumen strictures or stenosis has been widely
reported. This complication occurs in 1.2 % – 1.6 % of patients with suspected Crohn’s
disease and in 5 % – 13 % of patients with known Crohn’s disease [1]
[2]. This is the first report of a capsule being retained in an undiagnosed Crohn’s
fistula. The case also reflects how inaccurate barium studies can be in excluding
significant small-bowel disease and in predicting safe passage of a capsule. Furthermore,
an abdominal radiograph can be misleading in localizing the position of a capsule
(it appeared to be in the distal colon according to the radiographic evidence in this
case).
Capsule retention in an unrecognized Crohn’s fistula is therefore a potential complication
of video capsule endoscopy, and one that necessitates urgent surgical treatment. An
abdominal radiograph can be misleading in determining the location of a retained capsule
and a computed tomographic scan should be considered for all patients with suspicious
symptoms.
Endoscopy_UCTN_Code_CPL_1AI_2AB
