<prompt> The following statements are related to obstetric inversion:It is usually insidious in onsetIt is usually acuteIt is usually incompleteIn majority, it is spontaneous in nature  <response>: Uterine inversion is a condition in which there is inside out turning of the uterus.It is a rare cause of postpartum collapse but collapse occurs suddenly after labour.It is acute in onset.Mostly uterine inversion is complete i.e. of third degreeMost common cause of uterine inversion is mismanagement of the third stage of labourSpontaneous inversion can occur with an atonic uterus in 40 cases.Placenta accreta is a rare cause of uterine inversion. 