title: Asymptomatic primary mucinous cystadenocarcinoma of the appendix with a large abdominal mass: report of a case.
abstract: A case of cystadenocarcinoma of the appendix with a large cystic lesion is reported. A 49-year-old man undergoing a routine ultrasonic scan was incidentally found to have an abdominal mass measuring some 30 cm in size. The clinical presentation was asymptomatic, and the patient underwent a laparotomy without ascertaining a diagnosis preoperatively. The lesion, which derived from the appendix, was removed and was found to be cystic and contained huge amounts of mucin. The histological findings revealed a well-differentiated cystadenocarcinoma of the appendix, and immunohistochemical staining of the epithelium and mucinous implants in the mass demonstrated a positive reaction for carcinogenic antigens, including carcinoembryonic antigen and carbohydrate antigen.
authors.affiliation: Department of Surgery, Tokyo Denryoku Hospital, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Suto
authors.forename: A
authors.initials: A
authors.lastname: Tsuyuki
authors.forename: N
authors.initials: N
authors.lastname: Hiraoka
authors.forename: Y
authors.initials: Y
authors.lastname: Hosoda
authors.forename: K
authors.initials: K
authors.lastname: Kikuchi
authors.forename: Y
authors.initials: Y
authors.lastname: Fujishiro
mesh_terms: D000008:Abdominal Neoplasms / Q000175:diagnosis; D001063:Appendiceal Neoplasms / Q000097:blood / Q000175:diagnosis* / Q000601:surgery; D014408:Biomarkers, Tumor / Q000097:blood; D018395:CA-19-9 Antigen / Q000097:blood; D002272:Carcinoembryonic Antigen / Q000097:blood; D018282:Cystadenocarcinoma, Mucinous / Q000097:blood / Q000175:diagnosis* / Q000601:surgery; D003937:Diagnosis, Differential; D006801:Humans; D007432:Intraoperative Period; D008297:Male; D008875:Middle Aged
chemical_list: D014408:Biomarkers, Tumor; D018395:CA-19-9 Antigen; D002272:Carcinoembryonic Antigen