In a clinical case of shoulder presentation (transverse lie), fetal heart sounds are usually best heard at which maternal location?

After delivery of the fetal head, the baby's head retracts back against the perineum, producing the classic 'turtle sign.' Which obstetric emergency does this indicate?

A woman in labor is diagnosed with a fetal lie in which the longitudinal axis of the fetus is perpendicular to or does not coincide with that of the mother. Which malpresentation does this describe?