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that part of the fetus lying over the pelvic inlet; the presenting body part of the fetus. See also position and lie.
breech presentation presentation of the fetal buttocks, knees, or feet in labor; the feet may be alongside the buttocks (complete breech presentation); the legs may be extended against the trunk and the feet lying against the face (frank breech presentation); or one or both feet or knees may be prolapsed into the maternal vagina (incomplete breech presentation).
antigen presentation presentation of ingested antigens on the surface of macrophages near histocompatibility antigens; see also antigen presentation.
cephalic presentation presentation of any part of the fetal head in labor, whether the vertex, face, or brow.
compound presentation prolapse of one of the limbs of the fetus alongside the head in cephalic presentation or of one or both arms alongside a presenting breech at the beginning of labor.
footling presentation presentation of the fetus with one foot (single footling) or two feet (double footling) prolapsed into the maternal vagina.
funic presentation presentation of the umbilical cord in labor.
placental presentation placenta praevia.
shoulder presentation presentation with the fetal shoulder as the presenting part; see oblique lie and transverse lie.
transverse presentation transverse lie.
transverse presentation with the shoulder as the presenting part.
Synonym(s): acromion presentation
Etymology: AS, sculder + L, praesentare, to show
the part of the fetus that occupies the center of the birth canal when the presentation is associated with a transverse or oblique lie.
shoulder presentationA malposition that occurs during delivery in which the baby is in transverse lie across the uterus and perpendicular to the mother’s vertebral column. Shoulder presentation is easy to diagnose and difficult to delivery vaginally, with the occasional exception of a shoulder-presenting second twin, for which an internal version may be successful and the second twin delivered in a breech position.
shoulder presentationObstetrics A rare presenting position during delivery, which occurs when the baby lies in transverse position, across the uterus; SP is easily diagnosed and virtually impossible to delivery vaginally. See Cesarean section, Presentation.
shoul·der pre·sen·ta·tion(shōl'dĕr prez'ĕn-tā'shŭn)
Transverse presentation with the shoulder as the presenting part.