Suture periostitis. Presumptive – the vet looking at this horse did not know what these lumps across the face at eye level were nor did his x-rays help him identify them. They were spontaneous with no external indication of trauma in this 11 year old warmblood gelding. The skull is made of flat bones (as opposed to round bones with marrow inside) and where they come together are called suture lines. The cause is unknown though trauma is most likely followed by bone instability for an unknown reason. They are non-painful and often go away over time.

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