Minimal cytogenetic data are available for low malignant potential ovarian neoplasms, and none for those complicated by pseudomyxoma peritonei. Cytogenetic analysis was performed on tissue obtained from a patient undergoing repeat evacuation of mucin and mucin-producing implants in pseudomyxoma peritonei originating from an ovarian mucinous cystadenocarcinoma of low malignant potential. Specimens obtained from intraperitoneal implants during one of the cyto/mucin-reductive procedures revealed a mixture of normal female karyotype (46,XX) and an abnormal karyotype with a deletion involving the short arm of chromosome 1, and a balanced translocation involving chromosomes 2 and 6, [46,XXdel(1)(p21p31), t(2;6)(q35;p21)]. The vast majority of the cells from three subsequent cyto/mucin-reductive procedures displayed a normal female karyotype with few cells containing random abnormalities.