An abnormality of the premaxilla, the most anterior part of the maxilla that usually bears the central and lateral incisors and includes the anterior nasal spine and inferior aspect of the piriform rim. The premaxilla contains the bone and teeth of the primary palate. [https://orcid.org/0000-0001-5889-4463, https://orcid.org/0009-0006-4530-3154]