Case contributed by A.Prof Frank Gaillard




Case Discussion

Craniosynostosis involving the right lambdoid suture in a 1 year old.

There is no elevated bony ridge along the expected course of the lambdoid suture and the appearances are in keeping with premature sutural fusion. The fusion also involves the right side of the synchondrosis between the exoccipital and supraoccipital components of the occipital bone, reaching to the right posterolateral margin of the foramen magnum. No other sutural fusion is identified.

Consequent on the abnormal sutures is flattening of the right occiput and narrowing of the transverse diameter of the occipital bone at the level of the foramen magnum so that the right mastoid is medially displaced and more prominent in its craniocaudal dimension. Compared with the facial bones, the foramen magnum, petrous bones and occiput are rotated towards the left. The occipitomastoid and squamous temporal sutures appear normal. There is no material asymmetry of the middle cranial fossae.


Premature fusion of the right lambdoid suture and right intra-occipital synchondrosis with skull base asymmetry, rotation and occipital

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Case information

rID: 7881
Published: 20th Dec 2009
Last edited: 27th Nov 2015
Tag: skull
Inclusion in quiz mode: Included

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