Cleft Lip

**Definition:** Congenital defect in the upper lip where the maxillary prominence fails to merge with the merged medial nasal prominences. It is thought to be caused by faulty migration of the mesoderm in the head region.

**Tree numbers:** - C07.465.409.225 - C07.465.525.164 - C07.650.525.164 - C16.131.850.525.164

**Synonyms:** - Harelip