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
Treatment and prognosis
May necessitate caesarean section to avoid potential uterine rupture.
History and etymology
Named after L Bandl, a Viennese obstetrician.
- 1. Buhimschi CS, Buhimschi IA, Weiner CP. Ultrasonographic observation of Bandl's contraction ring. Int J Gynaecol Obstet. 2004;86 (1): 35-6. doi:10.1016/j.ijgo.2003.12.007 - Pubmed citation
- 2. Turrentine MA, Andres RL. Recurrent Bandl's ring as an etiology for failed vaginal birth after cesarean section. Am J Perinatol. 1994;11 (01): 65-6. doi:10.1055/s-2007-994539 - Pubmed citation
- 3. Lauria MR, Barthold JC, Zimmerman RA et-al. Pathologic uterine ring associated with fetal head trauma and subsequent cerebral palsy. Obstet Gynecol. 2007;109 (Supplement): 495-7. doi:10.1097/01.AOG.0000231678.01757.73 - Pubmed citation