has part has part has modifier Holoprosencephaly Lobar holoprosencephaly UMLS:C0431362 A type of holoprosencephaly in which most of the right and left cerebral hemispheres and lateral ventricles are separated but the most rostral aspect of the telencephalon, the frontal lobes, are fused, especially ventrally. HP:0006870 SNOMEDCT_US:253136007 mild intensity abnormal