title: Chronic abdominal pain, appendiceal mucinous neoplasm, and concurrent intestinal endometriosis: a case report.
abstract: BACKGROUND
  Although both appendiceal tumor and intestinal endometriosis have been reported as rare causes of abdominal pain, the coexistence of appendiceal mucinous neoplasm and ileal endometriosis has not previously been reported.
  
  
  METHODS
  A 41-year-old Japanese woman presented with a positive fecal occult blood test and a 3-year history of menstruation-related lower abdominal pain. A colonoscopy demonstrated extrinsic compression of the cecum, suggesting a mass arising from the appendix or adjacent structures. Abdominal imaging showed a 6-cm cystic mass with intraluminal thick fluids originating from the appendix. At ileocecal resection for an appendiceal tumor, a 2-cm mass in the terminal ileum was incidentally found, which was included in the surgical specimen. Microscopic examination confirmed a diagnosis of a mucinous neoplasm of the appendix with endometriosis of the terminal ileum.
  
  
  CONCLUSIONS
  To avoid urgent surgery for subsequent serious events associated with disease progression, appendiceal tumor and intestinal endometriosis should be ruled out in patients with chronic abdominal pain.
authors.affiliation: Department of Surgery, The Jikei University School of Medicine, 3-25-8 Nishi-shinbashi, Minato-ku, Tokyo, Japan. ms03kurogochi@jikei.ac.jp.
authors.forename: Takanori
authors.initials: T
authors.lastname: Kurogochi
authors.forename: Tetsuji
authors.initials: T
authors.lastname: Fujita
authors.forename: Naoko
authors.initials: N
authors.lastname: Iida
authors.forename: Ken
authors.initials: K
authors.lastname: Etoh
authors.forename: Masaichi
authors.initials: M
authors.lastname: Ogawa
authors.forename: Katsuhiko
authors.initials: K
authors.lastname: Yanaga