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Unstable lie

Authoring team

When the presentation of the foetus changes from day to day the lie is said to be unstable.

It is not a sinister sign in the grand multip - the uterus is relatively flaccid and able to accommodate a lot of movement of the fetus.

In other women it ought to be investigated as a possible sign of placenta praevia - the low lying placenta preventing engagement of the fetal head.

Other possible causes of an unstable lie include:

  • polyhydramnios
  • prematurity
  • subseptate uterus
  • pelvic tumours such as fibroids and ovarian cysts

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The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.

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