Scanzonis second os

Scanzoni's second os --> pathologic retraction ring

A constriction located at the junction of the thinned lower uterine segment with the thick retracted upper uterine segment, resulting from obstructed labour; this is one of the classic signs of threatened rupture of the uterus.

Synonym: bandl's ring, baudelocque's uterine circle, scanzoni's second os.

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