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| Case
of the Month |
By Dr Francis Lau Sing Lee, MBBS (Mal), M Med (Radiology) [UKM], FRCR, AM
(Mal)
Answer to Case Of the Month
Findings
Plain abdominal radiograph
showed mild dilatation
of loops of bowel in the abdomen.
CT Scan
The CT scan images shows a segment of dilated fluid filled loop of bowel
with thickened wall in the right iliac fossa extending into the pelvis. No
air was noted in the bowel wall or portal veins.
Operative Findings
At laparotomy, volvulus of the small bowel due to a band, probably
congenital was found. |
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The congenital band causing the volvulus is at the tip of the forceps |
The loop of bowel after release of the band |
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The resected gangrenous segment of the small bowel |
Progress
The post operative recovery was uneventful and the patient was well on
discharge.
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Discussion |
Accurate, early diagnosis of volvulus can be
sometimes difficult. Plain films are less sensitive, less specific and
findings on plain films may not be confirmatory in 20-52% of cases. The role
of CT is increasing in evaluating patients with suspected small bowel
obstruction. CT is a highly
accurate method in the evaluation of intestinal obstruction especially for
determining the level and cause of obstruction and should be the technique
of choice when clinical or plain radiographic findings are equivocal.
Small bowel volvulus is usually secondary to conditions such as malrotation,
congenital bands, postoperative adhesions, and internal hernias. Primary
small bowel volvulus in the adult is a rare, life-threatening emergency and
its recognition is paramount. Preoperative diagnosis is difficult, because
clinical examinations and plain films are of limited diagnostic value.
CT signs of volvulus are: U-shaped configuration or radial distribution of
distended and fluid-filled loops of the small bowel converging toward the
point of torsion, tightly twisted mesentery around the point of torsion
(whirl sign), fusiform tapering loop (triangular sign in the cross section
or beak sign in the longitudinal section), and signs of bowel ischemia or
infarct such as attached mesenteric fluid and blurred mesenteric folds. CT
enables us to diagnose not only small bowel volvulus but also bowel ischemia
or infarct.
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| About
the Author |
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Dr Francis Lau is currently attached to the
Island Hospital, Penang as a Radiologist.
We wish to thank surgeon, Mr T.J Wong for the
photos of the operative findings.
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Last Updated:
Tuesday, 04 January, 2005
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