Succesful vaginal delivery of locked monoamniotic twins
Miller, A.P.
Canadian Medical Association Journal 117(2): 158-159
1977
ISSN/ISBN: 0008-4409 PMID: 559540 Document Number: 111187
Interlocking of twin fetuses, usually recognized in the 2nd stage of labor, is rare, occurring only once in 90,000 deliveries. In 1958 Nissen reviewed the world literature and categorized the various types of interlocking. This case report describes a case of interlocking that fell into group 1 of Nissen's classification, the commonest type; baby A was in breech presentation and baby B in vertex, and B's head was compacted in the pelvis in advance of A's head. The case is of interest because it is rare for such interlocked twins to be delivered successfully per vaginam and for both babies to survive. The relatively large size of the infants in this report is also worthy of note.