Incomplete Border/Rim Sign

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Incomplete border/rim sign:

  • a pedunculated “mass” may display a portion of its border that is indistinct where the “mass” is attached and another portion of the border which is sharply marginated where the structure projects into air (surrounded by some lining)
  • The finding helps to establish that a “mass” has a soft tissue attachment and projects into an air-filled density

Another example:

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An umbilical hernia demonstrates a sharp border (blue arrows) where it projects outward into the air-filled atmosphere, and an indistinct border (white arrow) where it is attached to the body.

reference: http://www.learningradiology.com/notes/chestnotes/incompleterimsign.htm

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