Metopic ridge

A metopic ridge is a condition with a palpable vertical ridge on the forehead of the skull along the metopic suture line, which runs along the from the top of the forehead down to between the eyebrows or middle of the nose. It is sometimes called benign metopic ridge when differentiated from trigonocephaly ("triangle shaped forehead") which is also caused by premature closure of the metopic suture.

It is usually somewhat subjectively determined where the diagnostic threshold lies between metopic ridge and the more severe trigonocephaly, but machine learning algorithms have been demonstrated to classify patients consistent with classifications done manually by experts.