Hypoplasia of the premaxilla 2010-02-25T10:11:43Z Primary palate bone deficiency An abnormality of the premaxilla (the embryonic structure that forms the anterior part of the maxilla) causing it to appear relatively small in size compared to the other parts of the maxilla or other facial structures. Small premaxilla Premaxillary bone retrusion Premaxillary retrusion UMLS:C4072878 Underdevelopment of premaxilla Primary palate bone retrusion Premaxillary underdevelopment Hypoplasia of the primary palate bone Underdevelopment of the primary palate bone Hypoplasia of the intermaxillary bone Underdevelopment of the premaxilla UMLS:C4020770 Decreased size of the primary palate bone Decreased size of premaxilla Small primary palate bone Premaxillary bone deficiency HP:0010650 Abnormal jaw morphology