Cephalopelvic disproportion
A disproportion between the size of the normal fetal head and the pelvic diameters, referring to narrowing of the birth canal
Results in failure to progress in labor
Causes
The size of the fetal head and fetal position is a major contributor
Inlet contraction: when the narrowing of the anteroposterior diameter is less than 11 cm or the maximum transverse diameter is 12 cm or less; may stem from rickets in the early life of the mother or from an inherited small pelvis
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