Engaging diameter in brow presentation is
Brow presentation : Engaging diameter of head is Mentoveical which is 14 cm The position is commonly unstable and conves to either veex or face presentation Position can be confirmed by Palpating supraorbital ridges and anterior fontanel. Ref: Dutta Obs 9e pg 367.
Mento-veical
Mento-bregmatic
Suboccipito-bregmatic
Occipito-frontal
Abnormal labor