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Examples of the observed rib anomalies (indicated by arrows): (A) fetus lacking 12th ribs; (B) fetus with an unilateral cervical rib on the left side; (C) fetus with bilateral cervical ribs, an absent (left) and a rudimentary (right) 12th rib. (D) A fetus with a normal vertebral pattern (seven cervical, 12 thoracic and five lumbar vertebrae) to allow comparison.
