Wormian Bones
Intrasutural Bones

 

General Considerations

  • Accessory bones within a suture of the skull
  • Most often the lambdoid suture
  • Usually a normal variant occurring in as many as 80% of Asian population
  • Males more frequently affected than females
  • Pathological only when greater than 10 in number or large
  • A larger, single, centrally located intrasutural bone at the junction of the lambdoid suture and sagittal suture is called the os inca
  • They are named after a person (Ole Worm, a Danish anatomist) who described them

 

Diseases Associated With Wormian Bones

Cleidocranial Dysplasia

Pyknodysostosis

Osteogenesis Imperfecta

Hypothyroidism

Hypophosphatasia

Acro-osteolysis

Down Syndrome

 

 

 

wormian bones

Wormian Bones. Multiple accessory bones (white and blue arrows) are seen
within the lambdoid suture of the skull, characteristic of Wormian bones.
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