A transverse presentation, if unaided by art, may have five possible terminations: 1. Impaction, with excessive retraction of the upper uterine fibers, rupture and death of mother and fetus from hemorrhage or exhaustion. This is by far the most common outcome of neglected shoulder presentations. 2. Spontaneous birth by a doubled body, the condition termed "evolutio conduplicato corporis" by Roderer, in which the head and thorax are jammed tightly into each other and are born together. 3. Spontaneous rectification, that is, under exceptional conditions the lower fetal pole may be pushed downward and finally become the presenting part. 4. Spontaneous version, in which, as the result of excessive unilateral contractions of the uterus, the upper fetal pole is pushed downward and actually presents at the vulva. 5. Spontaneous evolution, as described by Douglas of Dublin. In this favorable termination, the presentation remains unchanged, but the trunk and buttocks, impelled by
PRICE NG. SPONTANEOUS EVOLUTION OF A TRANSVERSE PRESENTATION: WITH REPORT OF A CASE. JAMA. 1915;LXV(18):1547–1548. doi:10.1001/jama.1915.02580180051015
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