A case of an appendiceal mucin secreting adenocarcinoma resulting in a
large mucocele of the appendix with pseudomyxoma peritonei is reporte
d. Preoperative pointers suggesting the diagnosis were computed tomogr
aphy, a barium enema study, and a fine needle aspiration cytology, An
extended right hemicolectomy was performed. The patient has been follo
wed up for nearly nine months and is well.