Ileocolic intussusception due to mucocoele of the appendix causing small bowel obstruction

Case contributed by Dr Greg Tarr


One week generalised colicky abdominal pain and vomiting

Patient Data

Age: 70
Gender: Female

There is a 14 cm complex ileocolic and ileo-ileal intussusception. A tubular blind-ending structure is visualised within the intussusception, with a 3.5 cm, murally calcified cyst at its base. The mid and distal small bowel proximal to the intussusception is dilated measuring up to 3.7 cm.

Small volume ascites.

Note of an incidental small simple liver cyst.

Case Discussion

The intussusception was able to be reduced at surgery and the patient underwent an uncomplicated right hemicolectomy.

Histology showed:

Sections of the appendix wall show a lumen filled with partly calcified mucous. The wall is generally thinned and composed of dense collagenous tissue and in many places lacks an epithelial lining. However, in areas the lumen is lined by a single layer of columnar mucous secreting epithelium with mild atypia of the basally located nuclei. Occasional thin papillary projections are present. The epithelium rests directly on the fibrous wall. There is no high grade dysplasia or invasive malignancy. No mucous is seen dissecting through the appendix wall.

No malignancy in nodes.


Low grade appendiceal mucinous neoplasm.


Case also contributed by Dr. Shyam Sankaran

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Case information

rID: 41531
Case created: 6th Dec 2015
Last edited: 9th Oct 2016
Inclusion in quiz mode: Included

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