A benign form of holoprosencephaly with characteristics of midline defects without the typical holoprosencephaly defect in brain cleavage and which can variably manifest with microcephaly, hypotelorism, midline cleft lip and/or flat nose, choanal stenosis, pyriform sinus stenosis, coloboma as well as a single median maxillary incisor. [from
SNOMEDCT_US]