title: Appendiceal mucocele: sonographic findings.
abstract: BACKGROUND
  Appendiceal mucocele (AM) is a relatively rare disease, and its sonograms (US) have not been sufficiently analyzed.
  
  
  METHODS
  We studied the US findings of five patients with AM, with special attention to AM size, shape, internal echoes, and the mode of back echoes.
  
  
  RESULTS
  All five cases showed an elongated mass in the lower right abdomen. Internal echoes were present in all cases and M-mode US confirmed the movement of those echoes. The echogenecity of the lesion changed according to the frequency of the transducer used. Only one case showed posterior echo enhancement, and no case showed lateral shadowing.
  
  
  CONCLUSIONS
  AM appears as an elongated echo-poor mass without posterior echo enhancement. The cyst wall is less distinct than what one would expect for a cyst. When encountering such a mass in the lower right abdomen, one should strongly suspect an AM. In such cases, appropriate diagnostic and therapeutic strategies are especially necessary to prevent rupture that results in development of pseudomyxoma peritonei.
authors.affiliation: Center of Diagnostic Ultrasound, Red Cross Hospital, 222-1, Inashirozawa Saruta Kamikitade, Akita, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Sasaki
authors.forename: H
authors.initials: H
authors.lastname: Ishida
authors.forename: T
authors.initials: T
authors.lastname: Komatsuda
authors.forename: T
authors.initials: T
authors.lastname: Suzuki
authors.forename: K
authors.initials: K
authors.lastname: Konno
authors.forename: M
authors.initials: M
authors.lastname: Ohtaka
authors.forename: M
authors.initials: M
authors.lastname: Sato
authors.forename: J
authors.initials: J
authors.lastname: Ishida
authors.forename: T
authors.initials: T
authors.lastname: Sakai
authors.forename: S
authors.initials: S
authors.lastname: Watanabe
mesh_terms: D000368:Aged; D001065:Appendix / Q000000981:diagnostic imaging* / Q000473:pathology; D002429:Cecal Diseases / Q000000981:diagnostic imaging* / Q000473:pathology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009078:Mucocele / Q000000981:diagnostic imaging* / Q000473:pathology; D014463:Ultrasonography