Vanishing twin phenomenon

Case contributed by Dr Garth Kruger

Presentation

Vanishing twin in a twin pregnancy at 31 weeks gestation. This is a follow up ultrasound image.

Patient Data

Gender: Female

The image shows the vanishing twin face down with the spinal cord running from the skull base to the left of the image. The skull is resorbed and the residual skull base is visible with the spinal cord. The appearance of this fetus is unchanged since 22 weeks gestation. The second fetus is normal.

Case Discussion

This image is at 31 weeks gestation. The skull is resorbed and the residual skullbase is visible with the spinal cord. The appearance of this fetus is unchanged since 22 weeks gestation. The second fetus is normal.

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