Iqraalmost 2 years ago
Accordion sign
The accordion sign (also known as concertina sign) is seen on CT of the abdomen and refers to the similarity between the thickened edematous wall of pseudomembranous colitis and the folds of an accordion. This appearance is the result of hyperemic enhancing mucosa stretched over markedly thickened submucosal folds and is also seen when contrast is trapped between edematous haustral folds and pseudomembranes formed on the luminal surface of the colon
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