title: The "coffee bean" sign in periappendiceal and peridiverticular abscess.
abstract: Four cases of right lower quadrant abscess, each a clinical diagnostic dilemma, were recognized as abscesses surrounding a perforated viscus by application of the "coffee bean" sign on sonographic examination. The appearance in the right lower quadrant of a brightly echogenic finger-like projection extending into a cystic mass, with or without scattered internal echoes, should suggest the possibility of periappendiceal or diverticular abscess.
authors.forename: L
authors.initials: L
authors.lastname: Machan
authors.forename: M S
authors.initials: MS
authors.lastname: Pon
authors.forename: B J
authors.initials: BJ
authors.lastname: Wood
authors.forename: A D
authors.initials: AD
authors.lastname: Wong
mesh_terms: D000038:Abscess / Q000175:diagnosis*; D000293:Adolescent; D000328:Adult; D001065:Appendix; D002429:Cecal Diseases / Q000175:diagnosis; D004239:Diverticulitis, Colonic / Q000175:diagnosis*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D014463:Ultrasonography