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.

  • 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.

Share article

Article information

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

Support Radiopaedia and see fewer ads

Updating… Please wait.

Alert accept

Error Unable to process the form. Check for errors and try again.

Alert accept Thank you for updating your details.