Large bowel obstruction secondary to colon cancer

Case contributed by Dr Thuan Tzen, Koh

Presentation

Worsening abdominal pain. Bowels not opened for 1 week. Associated nausea and vomiting.

Patient Data

Age: 50
Gender: Female

Abdomen Xray

Modality: X-ray

Erect and supine abdominal radiographs demonstrate distension of the large bowel with faeces without definite faeces or gas seen within the rectum. No extraluminal gas identified. Left pelvic side wall surgical clips.

While the appearances could be due to colonic pseudo-obstruction, an obstructing lesion in the distal large bowel requires consideration and could be further assessed with CT.  

CT Abdomen

Modality: CT

There is a 2.5cm long stenotic segment of circumferential wall thickening in the distal sigmoid colon that causes moderate grade bowel obstruction. The large bowel proximal to the stenosis is distended with faeces. No pathologically enlarged draining lymph nodes. Sub-centimeter hypoattenuation foci in segment VIII, VII and IVb of the liver have a benign appearance but this should be confirmed with ultrasound.  There is a moderate volume of ascites.  No peritoneal thickening or a nodular appearance of the peritoneum. There is a 11 x 8 x 14 mm well-circumscribed cystic lesion in the body of the pancreas without duct dilatation. Rest of the pancreas has a normal appearance.  The gallbladder, spleen, adrenal glands and kidneys demonstrate normal postcontrast enhancement. Small hiatus hernia.  Multiple surgical clips in the left pelvic wall presumably related to previous hysterectomy / oopherectomy. Correlation with previous surgical history is essential.

Case Discussion

Primary colon cancer within the sigmoid presenting with subacute large bowel obstruction. The ascites may be reactive or malignant.  

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Case Information

rID: 34747
Case created: 7th Mar 2015
Last edited: 23rd Sep 2015
Inclusion in quiz mode: Included

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