<prompt> Engaging diameter in brow presentation isMento-veicalMento-bregmaticSuboccipito-bregmaticOccipito-frontal  <response>: 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. 