OBSintermediate
Arrange the placenta praevia types from least to greatest coverage of the internal os.
Answer
Type I: the placenta encroaches on the lower uterine segment but does not reach the internal os, Type II: the placenta reaches the internal os but does not cover it, Type III: the placenta partially occludes the internal os, Type IV: the internal os is fully covered
Explanation
The classification progresses from a placenta that encroaches on the lower uterine segment without reaching the os (**Type I**) to one that reaches but does not cover it (**Type II**), then partially covers it (**Type III**), and finally fully covers it (**Type IV**). Ordering by coverage helps distinguish the categories.\n\n**Key takeaway:** Increasing type from I to IV corresponds to increasing involvement of the internal os.\n\n**Glossary:** **Occlude**: Block or cover; **internal os**: The opening between the cervix and uterine cavity.
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