Sutures and Fontanelles: Widened Sutures as a Symptom of Defective Ossification
In this instance, no signs of increased ICP are present. Usually, the suture has sharp edges without prominent interdigitations. Suture widening is often associated with numerous wormian bones and a persistent fontanelle.
Rare causes of widened sutures include the following:
Pseudotumor cerebri, brain edema of unknown cause, post-traumatic with headache and papilledema: normal US, CT, and magnetic resonance imaging (MRI) findings
Superior sagittal sinus (SSS) thrombosis: diagnosed by US (Doppler), CT, or MRI
Vitamin A toxicity or deficiency
Long-term use of steroid medication
Long-term prostaglandin E1 therapy