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Os parietale divisum.

Devra B Becker1, James M Cheverud, Daniel P Govier

  • 1Cleft Palate and Craniofacial Deformities Institute, St. Louis Children's Hospital, Washington University Medical Center, St. Louis, MO 63110, USA.

Clinical Anatomy (New York, N.Y.)
|July 15, 2005
PubMed
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This study details an extremely rare case of a divided parietal bone (os parietale divisum) in an infant diagnosed with plagiocephaly. This in vivo finding highlights a unique congenital anomaly potentially linked to skull deformities.

Area of Science:

  • Craniofacial anatomy
  • Pediatric radiology
  • Congenital anomalies

Background:

  • Divisions of the parietal bone, or os parietale divisum, are exceptionally rare anatomical variations.
  • Previous descriptions have been limited to skeletal specimens, lacking in vivo clinical context.
  • Plagiocephaly is a common condition involving asymmetrical head shape in infants.

Observation:

  • A 36-week gestation male infant presented with multiple congenital anomalies and deformational plagiocephaly.
  • Computed Tomography (CT) imaging revealed a distinct suture dividing the left parietal bone into two segments.
  • The infant exhibited plagiocephalic features, including asymmetrical occipital flattening and protuberances, along with mandibular asymmetry and a head tilt.

Findings:

  • The case presents an in vivo instance of os parietale divisum in an infant with plagiocephaly.

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  • The anatomical variation was identified via CT imaging, demonstrating a clear division of the left parietal bone.
  • Despite cranial molding helmet therapy and physical therapy, head shape improvement was minimal after 16 months.

    • Implications:

    • This case expands the understanding of parietal bone variations, offering an in vivo example of os parietale divisum.
    • The association with plagiocephaly suggests a potential link between this rare anatomical variant and skull deformities.
    • Further research may explore the embryological basis and clinical significance of os parietale divisum in pediatric populations.