Appendix mucocele is a rare disease and it is usually diagnosed histopathologicaly inappendec to my specimens. When a cystic mass in appendix is seen during operation, appendiceal mucocele should be kept in mind to avoid iatrogenic perforation causing pseudomyxomaperitonei and possible concomitant malignancies should be searched.We reported 6 cases with the demographic, clinical, radiologic, preoperative and postoperative characteristicsand outcomes on patients of appendix mucocele that presented with or operated for acute appendicitis oracute abdomen.