Human Phenotype Ontology id HP_0002683 (Abnormal calvaria morphology) is abnormality of the morphology (structure) of the calvaria (skullcap), that is, of that part of the skull that is made up of the superior portions of the frontal bone, occipital bone, and parietal bones and covers the cranial cavity that contains the brain. Also known as: Abnormality of calvarium, Abnormality of cranial vault, Abnormality of the calvaria, Abnormality of the shape of calvarium, Abnormality of the skull cap, Abnormality of the skullcap.