Palpation of the anterior fontanelle together with orbital ridges and nasal bridge suggests an abnormal degree of extension of the fetal head. In brow presentation, the presenting anteroposterior diameter is the mentovertical diameter, which is relatively large.
You have just examined a 28-year-old primigravida in spontaneous labor, Examination findings are 0/5 palpable per abdomen, the cervix is 7 cm dilated, cephalic presentation, -1 station, anterior fontanelle palpable with orbital ridges and nasal bridge felt anterior. What is the presenting diameter of the fetus?
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Question context
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