A shoulder presentation occurs when the long axis of the fetus lies perpendicular or at right angles to the long axis of the mother. When the fetus is positioned this way, the part of the body that leads into the pelvis is the shoulder, forming what is clinically called a transverse lie. This is distinct from longitudinal lies like cephalic or breech presentations. Because the widest part of the fetus cannot fit through the pelvic brim in this orientation, engagement is physically impossible. If labor progresses without correction, it inevitably leads to obstructed labor, making early recognition by the midwife vital during antenatal care or early labor admissions in Nigerian clinical settings.
Several anatomical and physiological factors prevent the fetus from settling longitudinally into the lower uterine segment.
Abdominal palpation using Leopards maneuvers provides classic signs of a transverse lie. Inspection reveals an abnormally wide, transversely broadened abdomen that looks wider from side to side than it is from top to bottom. Palpation confirms the absence of a pole—neither the head nor the breech—in the fundus or the lower uterine pole. Instead, a hard ballotable head is felt distinctly in one flank, while the softer breech occupies the opposite flank. Auscultation of the fetal heart rate is typically heard best at or near the level of the umbilicus.
Vaginal examination in early labor with a transverse lie reveals an empty, high-riding cervix. As labor advances and membranes rupture, the shoulder is jammed firmly into the pelvis. The examiner may feel ribs that feel like a grid, the axilla (armpit) pointing toward the presenting side, or an arm prolapsing into the vagina. A neglected shoulder presentation occurs when the condition goes unrecognized, leading to strong uterine contractions that overstretch the lower uterine segment. This creates a severe obstetric emergency with a high risk of uterine rupture.
Management of a shoulder presentation depends entirely on the gestational age and clinical status of mother and baby. If diagnosed before labor at term, external cephalic version may be attempted under strict monitoring. However, once established labor begins with a transverse lie, vaginal delivery is strictly contraindicated. The standard life-saving intervention is an immediate caesarean section. Midwives must avoid attempting internal podalic version in modern hospital practice due to the extremely high risk of uterine rupture and fetal mortality.
Shoulder presentations carry grave risks for both mother and fetus if prompt medical intervention is delayed.
Early identification by midwives in primary care clinics and prompt referral to a comprehensive emergency obstetric care facility are essential to prevent these outcomes.