====== Metopic suture ======
{{ ::metopic_suture.jpg?400|}}
The metopic [[suture]] (also known as the median frontal suture) is a type of calvarial suture. It is often associated with [[frontal sinus agenesis]] or hypoplasia.

This suture runs through the midline across the frontal bone from the [[nasion]] to the [[bregma]], although it may often be incomplete. It usually fuses by around 9 months of age 1-4. 

A premature fusion of the suture is termed metopic synostosis (type of craniosynostosis) with can then result in trigonocephaly. 

The metopic suture is usually obliterated by about 7 years of age, but in rare cases it can persist 6 as an anatomical variant of little clinical significance but that it can be mistaken for frontal bone fracture.

====Differential diagnosis====

Frontal bone fracture
        
Metopic sutures have a characteristic midline position and demonstrate sutural interdigitations.