This meta-analysis showed that PS placement prevented PEP after ERCP as compared with no PS placement. We therefore recommend PS placement after ERCP for the prevention of PEP.

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A 78-years-old man presented with right lower quadrant pain for 2 months. Computed tomography revealed an irregular and multicystic mass near the cecum like as appedeceal mucocle. The lesion was diagnosed xanthogranulomatous appendicitis by histopathological findings of surgical specimen. Xanthogranuloma is uncommon disease, especially in the appendix. We report an interesting case of xanthogranulomatous appendicitis mimicking appendiceal mucocele in radiological images.Keywords Appendix . Xanthogranuloma A 78-year-old Japanese man was referred to our department by the general practitioner complaining of a 2-month history of right lower quadrant pain. He had no medical history. Blood examination showed no remarkable changes, and tumor markers were within the normal limits. An abdominal computed tomography (CT) revealed about 4 cm irregular and multicystic mass near the cecum (Fig. 1). On colonoscopy, a lesion protruding from the appendiceal orifice of the cecum was found and its top was covered with normal mucosa. Biopsy specimen revealed no malignancy. Based on CT and colonoscopy findings, the lesion was diagnosed as appendiceal mucocele. Subsequently the patient went for laparotomy, revealing 4×4 cm-sized irregular mass locating in the tip of the appendix. The patient underwent an ileocecal resection. Histopathological findings showed predominance

Occasional cases in which S-1/CPT-11 therapy was effective have been recently reported. The patient's tumor became resectable despite the discovery of colon cancer associated with bone metastasis at the initial examination, offering hope for cancer patients.