title: Ultrasonographic features of pseudotumorous form of ascariasis.
abstract: We report the ultrasonographic findings of a 60 year old woman with pseudotumorous form of ascariasis. Real-time ultrasonographic examination using a curved array transducer revealed grossly thickened small bowel loops, multiple small circular deposits throughout the peritoneal cavity, and a moderate amount of ascites. The English literature on the different forms of abdominal ascariasis is reviewed. Specific signs, which include the 'strip' sign, the 'four-lines', 'inner tube', or 'double tube' sign, the 'bull's eye' or 'target' sign, a 'worm mass' or 'spaghetti-like' appearance, and the 'zig-zag' sign can be present in any form of abdominal ascariasis, as they represent the image of the Ascaris worms visualized under ultrasonographic examination. However, the non-specific signs are not peculiar to A. lumbricoides infections, but are results of secondary changes due to A. lumbricoides infections in the corresponding organs.
authors.affiliation: Department of Radiology, Alice Ho Miu Ling Nethersole Hospital, New Territories, Hong Kong,
authors.forename: J Y
authors.initials: JY
authors.lastname: Hui
authors.forename: P C
authors.initials: PC
authors.lastname: Woo
authors.forename: P S
authors.initials: PS
authors.lastname: Kan
authors.forename: Y M
authors.initials: YM
authors.lastname: Lai
authors.forename: A P
authors.initials: AP
authors.lastname: Tang
mesh_terms: D000818:Animals; D001196:Ascariasis / Q000000981:diagnostic imaging*; D017164:Ascaris lumbricoides; D005260:Female; D006801:Humans; D007411:Intestinal Diseases, Parasitic / Q000000981:diagnostic imaging; D008875:Middle Aged; D010532:Peritoneal Diseases / Q000000981:diagnostic imaging; D014463:Ultrasonography