Mucocele or cystic distention of the appendix is a rare entity found in only 0.25% of all appendectomies and 8% of all appendicular tumors. We report a case of a 68-year-old female patient in whom asymptomatic mucocele was found at abdominal CT imaging a month after excision of recurrent invasive ductal carcinoma to the right pectoral region, and 26 years after modifed radical mastectomy. After adequate preoperative treatment, a right hemicolectomy was performed with the final pathology of mucocele of the appendix.Mukokela, odnosno cistično proširenje apendiksa rijetka je pojava koja se pronalazi u samo 0,25 % apendektomija, te čini samo 8 % svih tumora crvuljka. Prikazujemo slučaj 68-godišnje pacijentice kod koje je asimptomatska mukokela pronađena na CT-u abdomena mjesec dana nakon ekscizije recidiva duktalnog invazivnog karcinoma desne pektoralne regije, 26 godina nakon modificirane radikalne mastektomije. Nakon odgovarajuće preoperativne obrade učinjena je desna hemikolektomija s konačnim patohistološkim nalazom mukokele apendiksa
