Wormian bones are abnormal ossicles that develop from extra ossification centers within the cranium. They are most frequently located in the lambdoid suture or the coronal suture, and have been seen in the fontanelles, particularly the posterior fontanelle.
Commonest Cause
Idiopathic (Anatomic variant)
Other Causes
Mnemonic: PORK CHOPS
1. Pyknodyostosis
2. Osteogenesis imperfecta
3. Rickets
4. Kinky hair syndrome
5. Cleidocranial dysostosis
6. Hypothyroidism/hypophosphatasia
7. Otopalatodigital syndrome
8. Primary acro-osteolysis/Pachydermoperiostosis/Progeria
9. Syndrome of Downs