A non-cephalic, non-breech position, in which the foetus’ long axis is perpendicular to that of the mother’s. Transverse lies occur in 1:300 births, and are caused by lower uterine obstruction–e.g., placenta previa, intrauterine leiomyomas or an ovarian tumour in the cul-de-sac, or in a multiparous uterus with a lax wall.
Management C-section, less commonly, gentle external version, if the membranes have not ruptured.
The risk of complications from an internal version are unacceptably high and rarely performed.
Synonym Shoulder presentation (in part)