Primary mucinous cystadenoma of the appendix and ovary are commonly encountered in routine histopathology practice and several published classification schemes for appendiceal mucinous neoplasms have been proposed with resultant inconsistent use of terms and clinical doubt. While the nomenclature for ovarian mucinous neoplasms is more settled, the difficulty lies while distinguishing synchronous mucinous tumours of appendix and ovary to whether the primary is ovary or appendix or have a common origin. The synchronous or metachronous occurrance of multiple primary carcinomas in the genital tract is well recognized. However, simultaneous occurance of mucinous ovarian and appendiceal tumors is very rarely seen. Here, we report a rare case of giantmucinous cystadenoma of ovary and synchronous mucinous cystadenoma of the appendix in a 45 year old lady who presented with a large left abdomino-pelvic mass.
