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Related to anteroposterior diameter: external conjugate diameter
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The mass was approximately 5 cm wide, and its anteroposterior diameter was 2.
Further assessment of the MRI scans showed a reduction in the mediolateral diameter of the spinal cord compared with the anteroposterior diameter in patients with either subclinical or established DSP.
Based on 1988 ACOG classifications of forceps deliveries, an outlet delivery occurs when the scalp is visible at the introitus without separating the labia, when the fetal skull has reached the pelvic floor, when sagittal suture is in the anteroposterior diameter or the right or left occiput anterior or posterior position, when the fetal head is at or on the perineum, and when rotations do not exceed 45 degrees.

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