This is a separate (satellite) lobe away from the main body of the placenta, but attached to the latter by vessels running in the membranes.
Accessory lobes have an incidence of approximately 5%.
It is important to ensure that this lobe separates properly from the uterus, otherwise retention may cause PPH or sepsis. It should be suspected when there is a defect in the membranes a short distance from the expelled placental margins.
Management involves manual removal.
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