<prompt> The most common breech presentation in a nulliparous woman is:Frank breechComplete breechFootlingIncomplete breech  <response>: Ans: A Frank breech Ref: DC Duttas textbook of obstetrics, 7th edn, pg 374Explanation:BreechMC malpresentationMC cause - prematurityEtiologyPrematurity Maternal factors Fetal factors Uterine factors- multi- anomalies hydrocephalus- bicomuate, septate, arcuate uterus Pelvic factors Placental factors- contracted pelvis- placenta praevia, cornuo fundal attachment Cord factors Liquor factors- short cord- polyhydramnios, oligohydramniosTypes of breechComplete breechdegMore common in multi with lax abdominal wallIncomplete breechdeg Frank breech extended breech - MC in primideg Footling breechknee presentationCord prolapse Incidencedeg Frank breech -- 0.5deg Flexed breech - 5 deg Footling breech - 15Complicated breech - breech associated with other obstetric complications like p LSCS, placenta praevia. contracted pelvis etc.Complicated breech delivery - difficulties encountered during a vaginal breech delivery Ike extended arm etcRecurrent breech presentation - can occur in uterine anomalies like bicornuate or septate uterusDenominator - sacrumEngaging diameter- Buttocks- Shoulder- Head- bitrochanteric- bisacromial- suboccipito frontal10 ems12 ems10 ems 