Bandl ring

Dr Owen Kang and Dr Matt A. Morgan et al.

A Bandl ring may be seen during imaging of a patient in labour.

It is considered to be an uncommon finding in modern obstetrics (0.01-1.26%).

It is a pathologic retraction ring at "Barnes boundary line", which separates the upper contractile portion of the uterus from lower uterine segment. The constriction prevents the fetus from orienting toward the cervical os and obstructs normal labour.

Ultrasound and MRI
  • uterine constriction at the junction of the thinned lower uterine segment with a thickened, retracted upper uterine segment

May necessitate caesarean section to avoid potential uterine rupture.

Named after L Bandl, a Viennese obstetrician.

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Article information

rID: 34316
System: Obstetrics
Synonyms or Alternate Spellings:
  • Bandl's ring
  • Spastic contraction ring in the uterus

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