In which of the following malpositions there is a saucer-shaped depression observed, at or just below the umbilicus, on abdominal examination?

Correct option is C

In the occipitoposterior position, the fetal occiput lies against the mother’s sacrum, with the fetal back directed laterally or posteriorly. During abdominal examination, this leads to a saucer-shaped depression below the umbilicus, as the fetal back is not well-applied to the abdominal wall. The limbs may be felt easily, and the fetal heart sounds are heard laterally. This position is associated with prolonged labour and back pain.
Explanation of options: (a) Occipitoanterior position – This is the most favorable fetal position, where the fetal back is anterior. The back is easily palpable and no depression is seen. (b) Mentoanterior position – Seen in face presentations where the chin (mentum) is directed anteriorly. It does not cause the saucer-shaped depression described. (c) Occipitoposterior position – This is the correct answer. In this position, the fetal back is away from the abdominal wall, creating a noticeable central depression during palpation. (d) Mento-posterior position – This is a face presentation with the chin posterior, typically incompatible with vaginal delivery but not associated with a central abdominal depression.