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Mnemonics, Simplified Concepts & Thoughts

Wormian Bones

Epomedicine, Aug 7, 2024Aug 7, 2024

Last updated on August 7, 2024

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.

wormian bone
Panzer S, Peschel O, Haas-Gebhard B, Bachmeier BE, Pusch CM, Nerlich AG, CC BY 2.5, via Wikimedia Commons

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

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PGMEE, MRCS, USMLE, MBBS, MD/MS Musculoskeletal systemRadiology

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Epomedicine. Wormian Bones [Internet]. Epomedicine; 2024 Aug 7 [cited 2025 May 9]. Available from: https://epomedicine.com/medical-students/wormian-bones/.

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