Which type of abruption involves separation at the edge of the placenta?

Marginal abruption refers to the type of placental abruption where separation occurs at the edge or margin of the placenta. This can cause bleeding along the edge but may not always result in immediate or significant complications for the mother or fetus, depending on the extent of the separation. Understanding marginal abruption is crucial for monitoring the health of both the mother and the fetus, as it can sometimes resolve without severe impact.

Complete abruption involves a more significant separation of the placenta from the uterine wall, which can lead to severe bleeding and poses a greater risk to both maternal and fetal health. Concealed abruption entails bleeding that occurs behind the placenta, which can be dangerous since it may not be readily apparent until serious complications arise. Perinatal abruption is a term that is not typically used in the context of placental abruption classifications, making it less relevant in this situation. Therefore, the focus on the edge separation in marginal abruption accurately addresses the question asked.