asynclitism
Pronunciation: a-SIN-kli-tizm
Lateral deflection of the fetal head during labor, where the sagittal suture deviates from the midline of the maternal pelvis.
Full Definition
A condition during labor where the fetal head tilts to one side, causing the sagittal suture to lie closer to either the anterior (Naegele obliquity) or posterior (Litzmann obliquity) margin of the pelvic inlet. This lateral flexion can impede normal descent through the birth canal. Mild asynclitism is common and often corrects spontaneously, but severe cases may require intervention such as operative delivery. The condition is diagnosed through vaginal examination and can be confirmed with ultrasound.
Usage
Usage note: Distinguish from compound presentation where fetal limbs present alongside the head.
In Context
- "Vaginal examination revealed significant asynclitism with the sagittal suture positioned posteriorly." — Labor progress note
- "The asynclitism resolved with maternal position changes and continued labor progression." — Delivery summary